diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..30e4d57
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,66 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+InstaArchive Viewer is a React 19 + Vite 6 PWA for browsing archived Instagram data (both official Instagram exports and Instaloader archives). All archive parsing and media processing happens client-side in the browser — the Express backend only lists/serves files from disk, it never parses archive contents.
+
+## Commands
+
+- `npm install` — install dependencies
+- `npm run dev` — start Vite dev server on port 3000 (proxies `/api` and `/archives` to `http://localhost:3001`)
+- `npm run server` — start the Express backend (`tsx server.ts`) on port 3001, serving archives from `ARCHIVES_DIR` (defaults to `./_sample-archives`)
+- `npm run build` — build frontend to `dist/` (`vite build`) and backend to `dist-server/` (`tsc server.ts ...`)
+- `npm run lint` — type-check only (`tsc --noEmit`); there is no separate test suite or linter config
+- `npm run clean` — remove `dist/`
+
+For local development you typically need both `npm run dev` and `npm run server` running concurrently — the frontend alone has nothing to talk to for server-mode archives (local-folder mode works without the backend).
+
+## Architecture
+
+### Two archive sources, one data model
+
+The app supports loading archives two ways, unified behind the `ArchiveFile` interface (`src/types/index.ts`, implementations in `src/lib/archive-files.ts`):
+
+- **`LocalArchiveFile`** — wraps a browser `File` from a local folder picker (`webkitdirectory`). Fully offline, media is never uploaded anywhere.
+- **`RemoteArchiveFile`** — wraps a file served from the Express backend's `/archives/:name/...` static route, fetched on demand.
+
+All downstream parsing code (`useArchiveScanner`) operates only on `ArchiveFile[]` and doesn't care which backing implementation it got.
+
+### Scanning pipeline (`src/hooks/useArchiveScanner.ts`)
+
+This is the core of the app — a single large `handleFiles` function that:
+1. **Indexes** all files, detecting archive format by filename regex: Instagram "export" format (`YYYY-MM-DD_user - post_id[- idx][- story].ext`), Instaloader format (`YYYY-MM-DD_HH-MM-SS_UTC[_idx][_story].ext`), or a generic JSON-manifest format (`posts_1.json`, `reels_1.json`, `stories_1.json`, possibly `.json.xz`-compressed via `xz-decompress`).
+2. **Parses** according to detected format, building a `Map<postId, Partial<Post>>`. For JSON-manifest format, media files are matched to JSON entries by URI substring match, then by ID substring match, then by filename-derived heuristic — in that fallback order.
+3. **Falls back** to generic filename-prefix grouping when no posts were found via regex/JSON matching (treats files sharing a common basename as one carousel post, chunked into groups of 20).
+4. Detects a **profile picture** from `*_profile_pic.jpg` / `<username>.jpg` files, or falls back to the oldest image in the archive by filename sort ("Smart Fallback").
+5. **Caches** the final `{ posts, stories, profileMetadata, ... }` result to IndexedDB via `idb-keyval`, keyed by archive name (or `local_archive` for unnamed local folders) — this is what makes repeat visits load instantly. Both server and local archives are cached; the cache shape is documented inline in `useArchiveScanner`'s state (mirrors the `CacheData` interface in `GEMINI.md`).
+
+When modifying format-detection or media-matching logic, be aware the three code paths (JSON-manifest, filename-regex export/instaloader, generic fallback) are largely independent and a change to one rarely needs to touch the others — but all three write into the same `postsMap`.
+
+### Thumbnail generation (`src/hooks/useThumbnailQueue.ts` + `src/lib/thumbnail-worker.ts`)
+
+High-res images (>1MiB) are downscaled off the main thread:
+- `useThumbnailQueue` maintains a **serial** (one-at-a-time) queue — this is deliberate, not a bug: decoding multiple 50MP+ images concurrently causes OOM crashes in the browser.
+- Actual resizing happens in `thumbnail-worker.ts` using `OffscreenCanvas`/`createImageBitmap` inside a Web Worker.
+- Results are cached in IndexedDB under a `thumb_<id>` key, checked before falling back to the worker, so thumbnails persist across sessions.
+
+### URL state sync (`src/App.tsx`)
+
+App state (selected archive, active tab, selected post) is synchronized with URL query params (`?a=`, `?t=`, `?p=`) via `URLSearchParams` + `window.history.replaceState` in a cluster of `useEffect` hooks — this is what enables permalinks/deep-linking. When adding new shareable state, follow this pattern rather than introducing a router.
+
+### Backend (`server.ts`)
+
+Minimal Express server, three responsibilities only:
+- `GET /api/archives` — lists subdirectories of `ARCHIVES_DIR` (skipping dotfiles/`@`/`_`-prefixed dirs) as `ServerArchive[]`, guessing a thumbnail per archive.
+- `GET /api/archives/:name/files` — recursively lists all files in one archive directory.
+- Static-serves `ARCHIVES_DIR` under `/archives` and, in production, serves the built `dist/` frontend with an SPA fallback.
+
+It does no parsing of archive/JSON contents — that's entirely client-side in `useArchiveScanner`. `ARCHIVES_DIR` is resolved from the `ARCHIVES_DIR` env var (see `.env` / Docker volume mount at `/archives`).
+
+### PWA / build quirks
+
+- `vite.config.ts` sets `hmr: process.env.DISABLE_HMR !== 'true'` — this is intentionally left alone; it exists to disable file-watch flicker when running under AI Studio-style agent editing. Don't "clean up" or remove it.
+- `workbox.navigateFallbackDenylist` excludes `/api` and `/archives` from the SPA fallback so those routes hit the real server/static files instead of `index.html` (needed for "open original file in new tab").
+- Service worker uses `registerType: 'autoUpdate'` with hourly periodic checks — new deployments propagate to open clients automatically.
diff --git a/Dockerfile b/Dockerfile
index db651a8..9db550b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -18,6 +18,9 @@ FROM node:20-slim AS runtime
 ENV NODE_ENV=production
 ENV PORT=3000
 ENV ARCHIVES_DIR=/archives
+# Where the archive index is persisted; mount a volume here so a restart does
+# not have to re-walk the whole archive root.
+ENV CACHE_DIR=/cache
 
 WORKDIR /app
 
@@ -25,12 +28,16 @@ WORKDIR /app
 COPY package*.json ./
 RUN npm ci --omit=dev
 
-# Copy built assets and server
+# Copy built assets and server. The whole dist-server tree is needed: the
+# server imports shared archive-grouping logic emitted alongside it.
 COPY --from=build /app/dist ./dist
-COPY --from=build /app/dist-server/server.js ./server.js
+COPY --from=build /app/dist-server/ ./
 
-# Ensure archives directory exists
-RUN mkdir -p /archives
+# Ensure archives and cache directories exist, writable by the runtime user.
+RUN mkdir -p /archives /cache && chown node:node /cache
+
+# Drop root: the server reads the archives volume and writes only its index.
+USER node
 
 EXPOSE 3000
 
diff --git a/compose.yml b/compose.yml
index 698cd29..9ea9362 100644
--- a/compose.yml
+++ b/compose.yml
@@ -5,7 +5,13 @@ services:
       - "3000:3000"
     volumes:
       - ./archives:/archives:ro,z
+      # Persists the archive index so restarts don't re-walk every file.
+      - instaarchive-cache:/cache
     environment:
       - PORT=3000
       - ARCHIVES_DIR=/archives
+      - CACHE_DIR=/cache
     restart: unless-stopped
+
+volumes:
+  instaarchive-cache:
diff --git a/dist-server/server.js b/dist-server/server.js
deleted file mode 100644
index 80c3c16..0000000
--- a/dist-server/server.js
+++ /dev/null
@@ -1,137 +0,0 @@
-import express from 'express';
-import fs from 'fs';
-import path from 'path';
-import { fileURLToPath } from 'url';
-import dotenv from 'dotenv';
-import os from 'os';
-dotenv.config();
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = path.dirname(__filename);
-const app = express();
-const PORT = process.env.PORT || 3001;
-const ARCHIVES_DIR = path.resolve(process.env.ARCHIVES_DIR || path.join(__dirname, '_sample-archives'));
-console.log(`[Server] Initializing...`);
-console.log(`[Server] Running as user: ${os.userInfo().username} (UID: ${os.userInfo().uid}, GID: ${os.userInfo().gid})`);
-console.log(`[Server] Environment ARCHIVES_DIR: ${process.env.ARCHIVES_DIR}`);
-console.log(`[Server] Resolved ARCHIVES_DIR: ${ARCHIVES_DIR}`);
-// Ensure archives directory exists
-if (!fs.existsSync(ARCHIVES_DIR)) {
-    console.warn(`[Server] Warning: Archives directory not found at ${ARCHIVES_DIR}. Creating it...`);
-    try {
-        fs.mkdirSync(ARCHIVES_DIR, { recursive: true });
-    }
-    catch (err) {
-        console.error(`[Server] Failed to create archives directory:`, err);
-    }
-}
-else {
-    console.log(`[Server] Archives directory exists.`);
-}
-app.use(express.json());
-// API: List archives (subdirectories in ARCHIVES_DIR)
-app.get('/api/archives', (req, res) => {
-    try {
-        console.log(`[API] Listing archives from ${ARCHIVES_DIR}...`);
-        const items = fs.readdirSync(ARCHIVES_DIR, { withFileTypes: true });
-        console.log(`[API] Found ${items.length} total items in archives directory.`);
-        const archives = items
-            .filter(item => {
-            const isDir = item.isDirectory();
-            const isHidden = item.name.startsWith('.') || item.name.startsWith('@') || item.name.startsWith('_');
-            if (!isDir)
-                return false;
-            if (isHidden) {
-                console.log(`[API] Skipping system/hidden directory: ${item.name}`);
-                return false;
-            }
-            return true;
-        })
-            .map(item => {
-            // Try to find a profile pic or first image for the thumbnail
-            const archivePath = path.join(ARCHIVES_DIR, item.name);
-            try {
-                const files = fs.readdirSync(archivePath);
-                console.log(`[API] Found archive: ${item.name} (${files.length} files)`);
-                let thumbnail = '';
-                const profilePic = files.find(f => f.toLowerCase().includes('_profile_pic.jpg') || f.toLowerCase() === `${item.name.toLowerCase()}.jpg`);
-                if (profilePic) {
-                    thumbnail = `/archives/${item.name}/${profilePic}`;
-                }
-                else {
-                    const firstImage = files.find(f => /\.(jpg|jpeg|png|webp)$/i.test(f));
-                    if (firstImage)
-                        thumbnail = `/archives/${item.name}/${firstImage}`;
-                }
-                return {
-                    name: item.name,
-                    thumbnail,
-                    path: item.name,
-                    fileCount: files.length
-                };
-            }
-            catch (e) {
-                console.error(`[API] Could not read subdirectory ${item.name}:`, e);
-                return null;
-            }
-        })
-            .filter(Boolean);
-        console.log(`[API] Returning ${archives.length} validated archives.`);
-        res.json(archives);
-    }
-    catch (err) {
-        if (err.code === 'EACCES') {
-            console.error(`[API] Permission Denied! The server (UID ${os.userInfo().uid}) cannot read ${ARCHIVES_DIR}.`);
-            console.error(`[API] Hint: If using Linux/Docker, check folder permissions (chmod 755) or SELinux context (append :z to your volume mount).`);
-        }
-        else {
-            console.error('[API] Error listing archives:', err);
-        }
-        res.status(500).json({ error: 'Permission denied or failed to list archives' });
-    }
-});
-// API: List all files in an archive (recursive)
-app.get('/api/archives/:name/files', (req, res) => {
-    const archiveName = req.params.name;
-    const archivePath = path.join(ARCHIVES_DIR, archiveName);
-    if (!fs.existsSync(archivePath)) {
-        return res.status(404).json({ error: 'Archive not found' });
-    }
-    try {
-        const walk = (dir, base = '') => {
-            let results = [];
-            const list = fs.readdirSync(dir);
-            list.forEach(file => {
-                const filePath = path.join(dir, file);
-                const relativePath = path.join(base, file);
-                const stat = fs.statSync(filePath);
-                if (stat && stat.isDirectory()) {
-                    results = results.concat(walk(filePath, relativePath));
-                }
-                else {
-                    results.push(relativePath);
-                }
-            });
-            return results;
-        };
-        const files = walk(archivePath);
-        res.json(files);
-    }
-    catch (err) {
-        console.error('Error listing files:', err);
-        res.status(500).json({ error: 'Failed to list files' });
-    }
-});
-// Serve archive files
-app.use('/archives', express.static(ARCHIVES_DIR));
-// Serve production frontend
-const distPath = path.join(__dirname, 'dist');
-if (fs.existsSync(distPath)) {
-    app.use(express.static(distPath));
-    app.get('*', (req, res) => {
-        res.sendFile(path.join(distPath, 'index.html'));
-    });
-}
-app.listen(PORT, () => {
-    console.log(`Server running at http://localhost:${PORT}`);
-    console.log(`Serving archives from: ${ARCHIVES_DIR}`);
-});
diff --git a/package-lock.json b/package-lock.json
index f086c8b..a19759d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,17 +1,15 @@
 {
-  "name": "react-example",
-  "version": "0.0.0",
+  "name": "instaarchive-viewer",
+  "version": "1.3.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "react-example",
-      "version": "0.0.0",
+      "name": "instaarchive-viewer",
+      "version": "1.3.0",
       "dependencies": {
-        "@google/genai": "^1.29.0",
         "@tailwindcss/vite": "^4.1.14",
         "@vitejs/plugin-react": "^5.0.4",
-        "better-sqlite3": "^12.4.1",
         "clsx": "^2.1.1",
         "date-fns": "^4.1.0",
         "dotenv": "^17.2.3",
@@ -22,18 +20,21 @@
         "react": "^19.0.0",
         "react-dom": "^19.0.0",
         "tailwind-merge": "^3.5.0",
+        "tsx": "^4.21.0",
         "vite": "^6.2.0",
         "xz-decompress": "^0.2.3"
       },
       "devDependencies": {
         "@types/express": "^4.17.21",
         "@types/node": "^22.14.0",
+        "@types/react": "^19.2.18",
+        "@types/react-dom": "^19.2.4",
         "autoprefixer": "^10.4.21",
         "tailwindcss": "^4.1.14",
-        "tsx": "^4.21.0",
         "typescript": "~5.8.2",
         "vite": "^6.2.0",
-        "vite-plugin-pwa": "^1.2.0"
+        "vite-plugin-pwa": "^1.2.0",
+        "vitest": "^3.2.7"
       }
     },
     "node_modules/@apideck/better-ajv-errors": {
@@ -2007,46 +2008,6 @@
         "node": ">=18"
       }
     },
-    "node_modules/@google/genai": {
-      "version": "1.44.0",
-      "resolved": "https://registry.npmjs.org/@google/genai/-/genai-1.44.0.tgz",
-      "integrity": "sha512-kRt9ZtuXmz+tLlcNntN/VV4LRdpl6ZOu5B1KbfNgfR65db15O6sUQcwnwLka8sT/V6qysD93fWrgJHF2L7dA9A==",
-      "license": "Apache-2.0",
-      "dependencies": {
-        "google-auth-library": "^10.3.0",
-        "p-retry": "^4.6.2",
-        "protobufjs": "^7.5.4",
-        "ws": "^8.18.0"
-      },
-      "engines": {
-        "node": ">=20.0.0"
-      },
-      "peerDependencies": {
-        "@modelcontextprotocol/sdk": "^1.25.2"
-      },
-      "peerDependenciesMeta": {
-        "@modelcontextprotocol/sdk": {
-          "optional": true
-        }
-      }
-    },
-    "node_modules/@isaacs/cliui": {
-      "version": "8.0.2",
-      "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
-      "integrity": "sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==",
-      "license": "ISC",
-      "dependencies": {
-        "string-width": "^5.1.2",
-        "string-width-cjs": "npm:string-width@^4.2.0",
-        "strip-ansi": "^7.0.1",
-        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
-        "wrap-ansi": "^8.1.0",
-        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
-      },
-      "engines": {
-        "node": ">=12"
-      }
-    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
@@ -2103,80 +2064,6 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
-    "node_modules/@pkgjs/parseargs": {
-      "version": "0.11.0",
-      "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
-      "integrity": "sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==",
-      "license": "MIT",
-      "optional": true,
-      "engines": {
-        "node": ">=14"
-      }
-    },
-    "node_modules/@protobufjs/aspromise": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/@protobufjs/aspromise/-/aspromise-1.1.2.tgz",
-      "integrity": "sha512-j+gKExEuLmKwvz3OgROXtrJ2UG2x8Ch2YZUxahh+s1F2HZ+wAceUNLkvy6zKCPVRkU++ZWQrdxsUeQXmcg4uoQ==",
-      "license": "BSD-3-Clause"
-    },
-    "node_modules/@protobufjs/base64": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/@protobufjs/base64/-/base64-1.1.2.tgz",
-      "integrity": "sha512-AZkcAA5vnN/v4PDqKyMR5lx7hZttPDgClv83E//FMNhR2TMcLUhfRUBHCmSl0oi9zMgDDqRUJkSxO3wm85+XLg==",
-      "license": "BSD-3-Clause"
-    },
-    "node_modules/@protobufjs/codegen": {
-      "version": "2.0.4",
-      "resolved": "https://registry.npmjs.org/@protobufjs/codegen/-/codegen-2.0.4.tgz",
-      "integrity": "sha512-YyFaikqM5sH0ziFZCN3xDC7zeGaB/d0IUb9CATugHWbd1FRFwWwt4ld4OYMPWu5a3Xe01mGAULCdqhMlPl29Jg==",
-      "license": "BSD-3-Clause"
-    },
-    "node_modules/@protobufjs/eventemitter": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/@protobufjs/eventemitter/-/eventemitter-1.1.0.tgz",
-      "integrity": "sha512-j9ednRT81vYJ9OfVuXG6ERSTdEL1xVsNgqpkxMsbIabzSo3goCjDIveeGv5d03om39ML71RdmrGNjG5SReBP/Q==",
-      "license": "BSD-3-Clause"
-    },
-    "node_modules/@protobufjs/fetch": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/@protobufjs/fetch/-/fetch-1.1.0.tgz",
-      "integrity": "sha512-lljVXpqXebpsijW71PZaCYeIcE5on1w5DlQy5WH6GLbFryLUrBD4932W/E2BSpfRJWseIL4v/KPgBFxDOIdKpQ==",
-      "license": "BSD-3-Clause",
-      "dependencies": {
-        "@protobufjs/aspromise": "^1.1.1",
-        "@protobufjs/inquire": "^1.1.0"
-      }
-    },
-    "node_modules/@protobufjs/float": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/@protobufjs/float/-/float-1.0.2.tgz",
-      "integrity": "sha512-Ddb+kVXlXst9d+R9PfTIxh1EdNkgoRe5tOX6t01f1lYWOvJnSPDBlG241QLzcyPdoNTsblLUdujGSE4RzrTZGQ==",
-      "license": "BSD-3-Clause"
-    },
-    "node_modules/@protobufjs/inquire": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/@protobufjs/inquire/-/inquire-1.1.0.tgz",
-      "integrity": "sha512-kdSefcPdruJiFMVSbn801t4vFK7KB/5gd2fYvrxhuJYg8ILrmn9SKSX2tZdV6V+ksulWqS7aXjBcRXl3wHoD9Q==",
-      "license": "BSD-3-Clause"
-    },
-    "node_modules/@protobufjs/path": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/@protobufjs/path/-/path-1.1.2.tgz",
-      "integrity": "sha512-6JOcJ5Tm08dOHAbdR3GrvP+yUUfkjG5ePsHYczMFLq3ZmMkAD98cDgcT2iA1lJ9NVwFd4tH/iSSoe44YWkltEA==",
-      "license": "BSD-3-Clause"
-    },
-    "node_modules/@protobufjs/pool": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/@protobufjs/pool/-/pool-1.1.0.tgz",
-      "integrity": "sha512-0kELaGSIDBKvcgS4zkjz1PeddatrjYcmMWOlAuAPwAeccUrPHdUqo/J6LiymHHEiJT5NrF1UVwxY14f+fy4WQw==",
-      "license": "BSD-3-Clause"
-    },
-    "node_modules/@protobufjs/utf8": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/@protobufjs/utf8/-/utf8-1.1.0.tgz",
-      "integrity": "sha512-Vvn3zZrhQZkkBE8LSuW3em98c0FwgO4nxzv6OdSxPKJIEKY2bGbHn+mhGIPerzI4twdxaP8/0+06HBpwf345Lw==",
-      "license": "BSD-3-Clause"
-    },
     "node_modules/@rolldown/pluginutils": {
       "version": "1.0.0-rc.3",
       "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.0-rc.3.tgz",
@@ -2911,6 +2798,17 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/chai": {
+      "version": "5.2.3",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-5.2.3.tgz",
+      "integrity": "sha512-Mw558oeA9fFbv65/y4mHtXDs9bPnFMZAL/jxdPFUpOHHIXX91mcgEHbS5Lahr+pwZFR8A7GQleRWeI6cGFC2UA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/deep-eql": "*",
+        "assertion-error": "^2.0.1"
+      }
+    },
     "node_modules/@types/connect": {
       "version": "3.4.38",
       "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.38.tgz",
@@ -2921,6 +2819,13 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/deep-eql": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/@types/deep-eql/-/deep-eql-4.0.2.tgz",
+      "integrity": "sha512-c9h9dVVMigMPc4bwTvC5dxqtqJZwQPePsWjPlpSOnojbor6pGqdk541lfA7AqFQr5pB1BRdq0juY9db81BwyFw==",
+      "dev": true,
+      "license": "MIT"
+    },
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+      "bin": {
+        "vite-node": "vite-node.mjs"
+      },
+      "engines": {
+        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
     "node_modules/vite-plugin-pwa": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/vite-plugin-pwa/-/vite-plugin-pwa-1.2.0.tgz",
@@ -8504,13 +7841,77 @@
         "@esbuild/win32-x64": "0.25.12"
       }
     },
-    "node_modules/web-streams-polyfill": {
-      "version": "3.3.3",
-      "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.3.3.tgz",
-      "integrity": "sha512-d2JWLCivmZYTSIoge9MsgFCZrt571BikcWGYkjC1khllbTeDlGqZ2D8vD8E/lJa8WGWbb7Plm8/XJYV7IJHZZw==",
+    "node_modules/vitest": {
+      "version": "3.2.7",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-3.2.7.tgz",
+      "integrity": "sha512-KrxIJ62Fd89gfysR4WotlgZABiz2dqFPgqGzX7s+CwsqLFomRH7777ZcrOD6+WVAh7khPQP41A+BKbpcJFrdEg==",
+      "dev": true,
       "license": "MIT",
+      "dependencies": {
+        "@types/chai": "^5.2.2",
+        "@vitest/expect": "3.2.7",
+        "@vitest/mocker": "3.2.7",
+        "@vitest/pretty-format": "^3.2.7",
+        "@vitest/runner": "3.2.7",
+        "@vitest/snapshot": "3.2.7",
+        "@vitest/spy": "3.2.7",
+        "@vitest/utils": "3.2.7",
+        "chai": "^5.2.0",
+        "debug": "^4.4.1",
+        "expect-type": "^1.2.1",
+        "magic-string": "^0.30.17",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.2",
+        "std-env": "^3.9.0",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^0.3.2",
+        "tinyglobby": "^0.2.14",
+        "tinypool": "^1.1.1",
+        "tinyrainbow": "^2.0.0",
+        "vite": "^5.0.0 || ^6.0.0 || ^7.0.0-0",
+        "vite-node": "3.2.4",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
       "engines": {
-        "node": ">= 8"
+        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@types/debug": "^4.1.12",
+        "@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
+        "@vitest/browser": "3.2.7",
+        "@vitest/ui": "3.2.7",
+        "happy-dom": "*",
+        "jsdom": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@types/debug": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
       }
     },
     "node_modules/webidl-conversions": {
@@ -8536,6 +7937,7 @@
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
       "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "dev": true,
       "license": "ISC",
       "dependencies": {
         "isexe": "^2.0.0"
@@ -8636,6 +8038,23 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/workbox-background-sync": {
       "version": "7.4.0",
       "resolved": "https://registry.npmjs.org/workbox-background-sync/-/workbox-background-sync-7.4.0.tgz",
@@ -9082,124 +8501,6 @@
         "workbox-core": "7.4.0"
       }
     },
-    "node_modules/wrap-ansi": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-8.1.0.tgz",
-      "integrity": "sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ==",
-      "license": "MIT",
-      "dependencies": {
-        "ansi-styles": "^6.1.0",
-        "string-width": "^5.0.1",
-        "strip-ansi": "^7.0.1"
-      },
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
-      }
-    },
-    "node_modules/wrap-ansi-cjs": {
-      "name": "wrap-ansi",
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
-      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
-      "license": "MIT",
-      "dependencies": {
-        "ansi-styles": "^4.0.0",
-        "string-width": "^4.1.0",
-        "strip-ansi": "^6.0.0"
-      },
-      "engines": {
-        "node": ">=10"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
-      }
-    },
-    "node_modules/wrap-ansi-cjs/node_modules/ansi-regex": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
-      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "node_modules/wrap-ansi-cjs/node_modules/ansi-styles": {
-      "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
-      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
-      "license": "MIT",
-      "dependencies": {
-        "color-convert": "^2.0.1"
-      },
-      "engines": {
-        "node": ">=8"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
-      }
-    },
-    "node_modules/wrap-ansi-cjs/node_modules/emoji-regex": {
-      "version": "8.0.0",
-      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
-      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
-      "license": "MIT"
-    },
-    "node_modules/wrap-ansi-cjs/node_modules/string-width": {
-      "version": "4.2.3",
-      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
-      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
-      "license": "MIT",
-      "dependencies": {
-        "emoji-regex": "^8.0.0",
-        "is-fullwidth-code-point": "^3.0.0",
-        "strip-ansi": "^6.0.1"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "node_modules/wrap-ansi-cjs/node_modules/strip-ansi": {
-      "version": "6.0.1",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
-      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
-      "license": "MIT",
-      "dependencies": {
-        "ansi-regex": "^5.0.1"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "node_modules/wrappy": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
-      "license": "ISC"
-    },
-    "node_modules/ws": {
-      "version": "8.19.0",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-8.19.0.tgz",
-      "integrity": "sha512-blAT2mjOEIi0ZzruJfIhb3nps74PRWTCz1IjglWEEpQl5XS/UNama6u2/rjFkDDouqr4L67ry+1aGIALViWjDg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=10.0.0"
-      },
-      "peerDependencies": {
-        "bufferutil": "^4.0.1",
-        "utf-8-validate": ">=5.0.2"
-      },
-      "peerDependenciesMeta": {
-        "bufferutil": {
-          "optional": true
-        },
-        "utf-8-validate": {
-          "optional": true
-        }
-      }
-    },
     "node_modules/xz-decompress": {
       "version": "0.2.3",
       "resolved": "https://registry.npmjs.org/xz-decompress/-/xz-decompress-0.2.3.tgz",
diff --git a/package.json b/package.json
index 7c5ad2a..2521a55 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "instaarchive-viewer",
   "private": true,
-  "version": "1.2.0",
+  "version": "1.3.0",
   "type": "module",
   "scripts": {
     "dev": "vite --port=3000 --host=0.0.0.0",
@@ -10,13 +10,13 @@
     "preview": "vite preview",
     "server": "tsx server.ts",
     "clean": "rm -rf dist",
-    "lint": "tsc --noEmit"
+    "lint": "tsc --noEmit",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "dependencies": {
-    "@google/genai": "^1.29.0",
     "@tailwindcss/vite": "^4.1.14",
     "@vitejs/plugin-react": "^5.0.4",
-    "better-sqlite3": "^12.4.1",
     "clsx": "^2.1.1",
     "date-fns": "^4.1.0",
     "dotenv": "^17.2.3",
@@ -34,10 +34,13 @@
   "devDependencies": {
     "@types/express": "^4.17.21",
     "@types/node": "^22.14.0",
+    "@types/react": "^19.2.18",
+    "@types/react-dom": "^19.2.4",
     "autoprefixer": "^10.4.21",
     "tailwindcss": "^4.1.14",
     "typescript": "~5.8.2",
     "vite": "^6.2.0",
-    "vite-plugin-pwa": "^1.2.0"
+    "vite-plugin-pwa": "^1.2.0",
+    "vitest": "^3.2.7"
   }
 }
diff --git a/public/fonts/fonts.css b/public/fonts/fonts.css
new file mode 100644
index 0000000..bb1afed
--- /dev/null
+++ b/public/fonts/fonts.css
@@ -0,0 +1,56 @@
+/* Self-hosted subset of Inter + Playfair Display.
+   Vendored so the PWA works offline and makes no third-party requests. */
+/* latin-ext */
+@font-face {
+  font-family: 'Inter';
+  font-style: normal;
+  font-weight: 300 700;
+  font-display: swap;
+  src: url(/fonts/inter-300_700-normal-b6db4a.woff2) format('woff2');
+  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
+}
+/* latin */
+@font-face {
+  font-family: 'Inter';
+  font-style: normal;
+  font-weight: 300 700;
+  font-display: swap;
+  src: url(/fonts/inter-300_700-normal-6ab57b.woff2) format('woff2');
+  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
+}
+/* latin-ext */
+@font-face {
+  font-family: 'Playfair Display';
+  font-style: italic;
+  font-weight: 400 900;
+  font-display: swap;
+  src: url(/fonts/playfair-display-400_900-italic-2d6d99.woff2) format('woff2');
+  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
+}
+/* latin */
+@font-face {
+  font-family: 'Playfair Display';
+  font-style: italic;
+  font-weight: 400 900;
+  font-display: swap;
+  src: url(/fonts/playfair-display-400_900-italic-d14361.woff2) format('woff2');
+  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
+}
+/* latin-ext */
+@font-face {
+  font-family: 'Playfair Display';
+  font-style: normal;
+  font-weight: 400 900;
+  font-display: swap;
+  src: url(/fonts/playfair-display-400_900-normal-ca7410.woff2) format('woff2');
+  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
+}
+/* latin */
+@font-face {
+  font-family: 'Playfair Display';
+  font-style: normal;
+  font-weight: 400 900;
+  font-display: swap;
+  src: url(/fonts/playfair-display-400_900-normal-61a963.woff2) format('woff2');
+  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
+}
diff --git a/public/fonts/inter-300_700-normal-6ab57b.woff2 b/public/fonts/inter-300_700-normal-6ab57b.woff2
new file mode 100644
index 0000000..d15208d
Binary files /dev/null and b/public/fonts/inter-300_700-normal-6ab57b.woff2 differ
diff --git a/public/fonts/inter-300_700-normal-b6db4a.woff2 b/public/fonts/inter-300_700-normal-b6db4a.woff2
new file mode 100644
index 0000000..479d010
Binary files /dev/null and b/public/fonts/inter-300_700-normal-b6db4a.woff2 differ
diff --git a/public/fonts/playfair-display-400_900-italic-2d6d99.woff2 b/public/fonts/playfair-display-400_900-italic-2d6d99.woff2
new file mode 100644
index 0000000..df1b08d
Binary files /dev/null and b/public/fonts/playfair-display-400_900-italic-2d6d99.woff2 differ
diff --git a/public/fonts/playfair-display-400_900-italic-d14361.woff2 b/public/fonts/playfair-display-400_900-italic-d14361.woff2
new file mode 100644
index 0000000..8ae1f1f
Binary files /dev/null and b/public/fonts/playfair-display-400_900-italic-d14361.woff2 differ
diff --git a/public/fonts/playfair-display-400_900-normal-61a963.woff2 b/public/fonts/playfair-display-400_900-normal-61a963.woff2
new file mode 100644
index 0000000..5a3fbbd
Binary files /dev/null and b/public/fonts/playfair-display-400_900-normal-61a963.woff2 differ
diff --git a/public/fonts/playfair-display-400_900-normal-ca7410.woff2 b/public/fonts/playfair-display-400_900-normal-ca7410.woff2
new file mode 100644
index 0000000..53c412b
Binary files /dev/null and b/public/fonts/playfair-display-400_900-normal-ca7410.woff2 differ
diff --git a/public/icon-192.png b/public/icon-192.png
new file mode 100644
index 0000000..cf98e4a
Binary files /dev/null and b/public/icon-192.png differ
diff --git a/public/icon-512.png b/public/icon-512.png
new file mode 100644
index 0000000..6919441
Binary files /dev/null and b/public/icon-512.png differ
diff --git a/server.ts b/server.ts
index f6eba46..7ff8424 100644
--- a/server.ts
+++ b/server.ts
@@ -4,6 +4,7 @@ import path from 'path';
 import { fileURLToPath } from 'url';
 import dotenv from 'dotenv';
 import os from 'os';
+import { ArchiveIndex } from './src/lib/archive-index.js';
 
 dotenv.config();
 
@@ -31,56 +32,85 @@ if (!fs.existsSync(ARCHIVES_DIR)) {
   console.log(`[Server] Archives directory exists.`);
 }
 
+const INDEX_PATH = process.env.ARCHIVE_INDEX_PATH
+  || path.join(process.env.CACHE_DIR || os.tmpdir(), 'instaarchive-index.json');
+const index = new ArchiveIndex(ARCHIVES_DIR, INDEX_PATH);
+
+// Warm in the background: the first walk of a large archive root is slow, but
+// everything after it is served from directory-mtime-keyed cache.
+index.load()
+  .then(() => index.warm())
+  .catch(err => console.error('[Index] Warm failed:', err));
+
+// Don't advertise the framework.
+app.disable('x-powered-by');
+
+/**
+ * Baseline security headers.
+ *
+ * The CSP allows blob: and data: because archive media is rendered from object
+ * URLs and cached thumbnails, and 'unsafe-inline' for styles because the
+ * animation library sets inline styles. Scripts stay restricted to same-origin,
+ * and no third-party origins are permitted at all — the app bundles its own
+ * fonts and icons.
+ */
+app.use((req, res, next) => {
+  res.setHeader('X-Content-Type-Options', 'nosniff');
+  res.setHeader('X-Frame-Options', 'SAMEORIGIN');
+  res.setHeader('Referrer-Policy', 'no-referrer');
+  res.setHeader('Cross-Origin-Resource-Policy', 'same-origin');
+  res.setHeader('Permissions-Policy', 'geolocation=(), microphone=(), camera=(), interest-cohort=()');
+  res.setHeader('Content-Security-Policy', [
+    "default-src 'self'",
+    "img-src 'self' blob: data:",
+    "media-src 'self' blob: data:",
+    "script-src 'self'",
+    "style-src 'self' 'unsafe-inline'",
+    "font-src 'self'",
+    "connect-src 'self'",
+    "worker-src 'self' blob:",
+    "frame-ancestors 'self'",
+    "object-src 'none'",
+    "base-uri 'self'",
+    "form-action 'self'",
+  ].join('; '));
+  next();
+});
+
 app.use(express.json());
 
-// API: List archives (subdirectories in ARCHIVES_DIR)
+/**
+ * Resolve a user-supplied archive name to an absolute path inside ARCHIVES_DIR.
+ *
+ * Express decodes route params *after* segment matching, so a name like
+ * `..%2f..%2fetc` arrives here as `../../etc` and would otherwise escape the
+ * archives root. Returns null for anything that resolves outside it.
+ */
+const resolveArchivePath = (archiveName: string): string | null => {
+  if (!archiveName || archiveName.includes('\0')) return null;
+  const resolved = path.resolve(ARCHIVES_DIR, archiveName);
+  if (resolved !== ARCHIVES_DIR && !resolved.startsWith(ARCHIVES_DIR + path.sep)) {
+    console.warn(`[Security] Rejected archive name escaping ARCHIVES_DIR: ${archiveName}`);
+    return null;
+  }
+  return resolved;
+};
+
+// API: List archives, grouped by profile. Costs one stat per source directory.
 app.get('/api/archives', (req, res) => {
   try {
-    console.log(`[API] Listing archives from ${ARCHIVES_DIR}...`);
-    const items = fs.readdirSync(ARCHIVES_DIR, { withFileTypes: true });
-    console.log(`[API] Found ${items.length} total items in archives directory.`);
-    
-    const archives = items
-      .filter(item => {
-        const isDir = item.isDirectory();
-        const isHidden = item.name.startsWith('.') || item.name.startsWith('@') || item.name.startsWith('_');
-        if (!isDir) return false;
-        if (isHidden) {
-          console.log(`[API] Skipping system/hidden directory: ${item.name}`);
-          return false;
-        }
-        return true;
-      })
-      .map(item => {
-        // Try to find a profile pic or first image for the thumbnail
-        const archivePath = path.join(ARCHIVES_DIR, item.name);
-        try {
-          const files = fs.readdirSync(archivePath);
-          console.log(`[API] Found archive: ${item.name} (${files.length} files)`);
-          
-          let thumbnail = '';
-          const profilePic = files.find(f => f.toLowerCase().includes('_profile_pic.jpg') || f.toLowerCase() === `${item.name.toLowerCase()}.jpg`);
-          if (profilePic) {
-            thumbnail = `/archives/${item.name}/${profilePic}`;
-          } else {
-            const firstImage = files.find(f => /\.(jpg|jpeg|png|webp)$/i.test(f));
-            if (firstImage) thumbnail = `/archives/${item.name}/${firstImage}`;
-          }
-
-          return {
-            name: item.name,
-            thumbnail,
-            path: item.name,
-            fileCount: files.length
-          };
-        } catch (e) {
-          console.error(`[API] Could not read subdirectory ${item.name}:`, e);
-          return null;
-        }
-      })
-      .filter(Boolean);
-    
-    console.log(`[API] Returning ${archives.length} validated archives.`);
+    const groups = index.groups();
+    const archives = Array.from(groups.entries()).map(([owner, sources]) => ({
+      name: owner,
+      thumbnail: index.thumbnailFor(owner, sources),
+      path: owner,
+      // Null until that profile has been indexed; the client treats it as unknown.
+      fileCount: index.countFor(sources),
+      // Directory mtimes: cheap to compute and enough to invalidate a stale cache.
+      signature: index.signatureFor(sources),
+      sources,
+    }));
+    console.log(`[API] Returning ${archives.length} archives.`);
     res.json(archives);
   } catch (err: any) {
     if (err.code === 'EACCES') {
@@ -93,33 +123,26 @@ app.get('/api/archives', (req, res) => {
   }
 });
 
-// API: List all files in an archive (recursive)
-app.get('/api/archives/:name/files', (req, res) => {
+/**
+ * List every file belonging to a profile, across its base and sidecar dirs.
+ *
+ * Paths are relative to ARCHIVES_DIR (so they include the source directory) and
+ * each entry carries its source kind, letting the client route posts, reels,
+ * stories and highlights without re-deriving the naming rules.
+ *
+ * Served from the directory index; only a directory whose mtime changed is
+ * re-walked.
+ */
+app.get('/api/archives/:name/files', async (req, res) => {
   const archiveName = req.params.name;
-  const archivePath = path.join(ARCHIVES_DIR, archiveName);
-
-  if (!fs.existsSync(archivePath)) {
-    return res.status(404).json({ error: 'Archive not found' });
+  if (!resolveArchivePath(archiveName)) {
+    return res.status(400).json({ error: 'Invalid archive name' });
   }
 
   try {
-    const walk = (dir: string, base: string = ''): string[] => {
-      let results: string[] = [];
-      const list = fs.readdirSync(dir);
-      list.forEach(file => {
-        const filePath = path.join(dir, file);
-        const relativePath = path.join(base, file);
-        const stat = fs.statSync(filePath);
-        if (stat && stat.isDirectory()) {
-          results = results.concat(walk(filePath, relativePath));
-        } else {
-          results.push(relativePath);
-        }
-      });
-      return results;
-    };
-
-    const files = walk(archivePath);
+    const files = await index.filesFor(archiveName);
+    if (!files) return res.status(404).json({ error: 'Archive not found' });
+    void index.save();
     res.json(files);
   } catch (err) {
     console.error('Error listing files:', err);
@@ -127,8 +150,14 @@ app.get('/api/archives/:name/files', (req, res) => {
   }
 });
 
-// Serve archive files
-app.use('/archives', express.static(ARCHIVES_DIR));
+// Serve archive files. Archive contents are immutable in practice, so cache
+// them aggressively; the client busts its own cache via fileCount.
+app.use('/archives', express.static(ARCHIVES_DIR, {
+  maxAge: '1y',
+  immutable: true,
+  index: false,
+  dotfiles: 'ignore',
+}));
 
 // Serve production frontend
 const distPath = path.join(__dirname, 'dist');
diff --git a/src/App.tsx b/src/App.tsx
index 861ace6..ce88049 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -15,11 +15,24 @@ import {
   Loader2,
 } from 'lucide-react';
 import { motion, AnimatePresence } from 'motion/react';
-import * as idb from 'idb-keyval';
 
 import { cn } from './lib/utils';
 import { LocalArchiveFile, RemoteArchiveFile } from './lib/archive-files';
-import { Post, ServerArchive } from './types';
+import {
+  deleteCachedArchive,
+  getCachedArchive,
+  listCachedArchives,
+  listCachedArchiveNames,
+  migrateLegacyCache,
+  restoreArchive,
+  saveDirectoryHandle,
+} from './lib/archive-cache';
+import {
+  filesFromDirectory,
+  isDirectoryPickerSupported,
+  pickDirectory,
+} from './lib/directory-handle';
+import { CacheData, Post, ServerArchive, ServerArchiveFile } from './types';
 import { ArchiveDashboard } from './components/ArchiveDashboard';
 import { StoryViewer } from './components/StoryViewer';
 import { PostModal } from './components/PostModal';
@@ -29,6 +42,7 @@ import { useThumbnailQueue } from './hooks/useThumbnailQueue';
 
 export default function App() {
   const [showStoryViewer, setShowStoryViewer] = useState(false);
+  const [activeHighlight, setActiveHighlight] = useState<string | null>(null);
   const [visiblePostsCount, setVisiblePostsCount] = useState(90);
   const [selectedPost, setSelectedPost] = useState<Post | null>(null);
   
@@ -37,33 +51,35 @@ export default function App() {
   const [activeTab, setActiveTab] = useState<'posts' | 'reels' | 'saved'>('posts');
   const [serverArchives, setServerArchives] = useState<ServerArchive[]>([]);
   const [cachedArchives, setCachedArchives] = useState<Set<string>>(new Set());
-  const [localCachedArchives, setLocalCachedArchives] = useState<any[]>([]);
+  const [localCachedArchives, setLocalCachedArchives] = useState<CacheData[]>([]);
   const [isServerMode, setIsServerMode] = useState(false);
+  /** True once GET /api/archives has settled, successfully or not. */
+  const [archivesFetched, setArchivesFetched] = useState(false);
   const [currentArchive, setCurrentArchive] = useState<ServerArchive | null>(null);
 
+  const [hasInitialLoaded, setHasInitialLoaded] = useState(false);
+
+  /**
+   * The query string as it was when the app booted.
+   *
+   * Captured during the first render because the URL is rewritten from app
+   * state as soon as anything loads; reading `window.location` later would see
+   * the rewritten value rather than the link the user actually followed.
+   */
+  const initialParamsRef = useRef(new URLSearchParams(window.location.search));
+
   const fileInputRef = useRef<HTMLInputElement>(null);
   const profilePicInputRef = useRef<HTMLInputElement>(null);
 
-  const { cacheHits, requestThumbnail } = useThumbnailQueue();
-
   const refreshCachedArchives = useCallback(async () => {
     try {
-      const keys = await idb.keys();
-      setCachedArchives(new Set(keys.map(String)));
-
-      const locals: any[] = [];
-      for (const key of keys) {
-        const data: any = await idb.get(key);
-        if (data && data.isLocal) {
-          // Fallback for missing allProfilePics in local cached metadata
-          if (!data.profileMetadata.allProfilePics) {
-            data.profileMetadata.allProfilePics = data.profileMetadata.profilePic ? [data.profileMetadata.profilePic] : [];
-          }
-          locals.push(data);
-        }
-      }
-      setLocalCachedArchives(locals);
-    } catch (e) {}
+      // Names come from key prefixes, so listing no longer deserializes every
+      // cached thumbnail blob just to find out which entries are archives.
+      setCachedArchives(new Set(await listCachedArchiveNames()));
+      setLocalCachedArchives((await listCachedArchives()).filter(a => a.isLocal));
+    } catch (e) {
+      console.error('[Cache] Failed to list cached archives:', e);
+    }
   }, []);
 
   const {
@@ -75,6 +91,8 @@ export default function App() {
     currentScanningImage,
     allPosts,
     allStories,
+    allHighlights,
+    setAllHighlights,
     profileMetadata,
     handleFiles,
     setAllPosts,
@@ -82,7 +100,8 @@ export default function App() {
     setProfileMetadata,
     setIsScanning,
     setScanningPhase,
-    resetScannerState
+    resetScannerState,
+    registerUrl
   } = useArchiveScanner('', currentArchive, refreshCachedArchives);
 
   const [lastLoadedScanningImage, setLastLoadedScanningImage] = useState<string | null>(null);
@@ -98,6 +117,9 @@ export default function App() {
     allProfilePics
   } = profileMetadata;
 
+  // Thumbnails are keyed per archive, so the queue is scoped to the open one.
+  const { cacheHits, requestThumbnail } = useThumbnailQueue(currentArchive?.name ?? username ?? '');
+
   useEffect(() => {
     fetch('/api/archives')
       .then(res => {
@@ -107,21 +129,51 @@ export default function App() {
         }
         return [];
       })
-      .then(data => setServerArchives(data))
-      .catch(() => setIsServerMode(false));
+      .then(data => setServerArchives(Array.isArray(data) ? data : []))
+      .catch(() => setIsServerMode(false))
+      // Deep-link resolution waits on this rather than on `isServerMode`, which
+      // is still false while the request is in flight.
+      .finally(() => setArchivesFetched(true));
   }, []);
 
   useEffect(() => {
-    refreshCachedArchives();
+    migrateLegacyCache().finally(refreshCachedArchives);
   }, [refreshCachedArchives]);
 
-  const clearCache = async (name: string) => { await idb.del(name); await refreshCachedArchives(); };
+  const clearCache = async (name: string) => { await deleteCachedArchive(name); await refreshCachedArchives(); };
+
+  /**
+   * Archives with a `- reels` sidecar directory say outright which posts are
+   * reels; only fall back to the "lone video" heuristic for archives that have
+   * no such directory.
+   */
+  const hasReelSource = useMemo(() => allPosts.some(p => p.source === 'reels'), [allPosts]);
+  const isReel = useCallback((p: Post) => (
+    hasReelSource ? p.source === 'reels' : p.media.length === 1 && p.media[0].type === 'video'
+  ), [hasReelSource]);
 
   const filteredPosts = useMemo(() => {
-    if (activeTab === 'reels') return allPosts.filter(p => p.media.length === 1 && p.media[0].type === 'video');
-    if (activeTab === 'posts') return allPosts.filter(p => !(p.media.length === 1 && p.media[0].type === 'video'));
+    if (activeTab === 'reels') return allPosts.filter(isReel);
+    if (activeTab === 'posts') return allPosts.filter(p => !isReel(p));
     return [];
-  }, [allPosts, activeTab]);
+  }, [allPosts, activeTab, isReel]);
+
+  /** Story highlights, grouped into the circles shown under the bio. */
+  const highlightGroups = useMemo(() => {
+    const groups = new Map<string, Post[]>();
+    for (const item of allHighlights) {
+      const title = item.highlightTitle?.trim() || 'Highlights';
+      if (!groups.has(title)) groups.set(title, []);
+      groups.get(title)!.push(item);
+    }
+    return Array.from(groups, ([title, items]) => ({
+      title,
+      items,
+      // The cover must be a still: most highlight items are videos, and a video
+      // URL in an <img> renders as a broken image.
+      cover: items.find(i => i.media[0]?.type === 'image')?.thumbnail,
+    }));
+  }, [allHighlights]);
 
   const handleTabChange = (tab: 'posts' | 'reels' | 'saved') => { setActiveTab(tab); setVisiblePostsCount(90); };
   const visiblePosts = useMemo(() => filteredPosts.slice(0, visiblePostsCount), [filteredPosts, visiblePostsCount]);
@@ -151,38 +203,50 @@ export default function App() {
     setScanningPhase('Checking Cache');
     
     try {
-      const cachedData = await idb.get(archive.name);
+      const cachedData = await getCachedArchive(archive.name);
       if (cachedData) {
-        console.log(`[Cache] Found cached data for ${archive.name}. File count: ${cachedData.fileCount} (Server has: ${archive.fileCount})`);
-        if (cachedData.fileCount === archive.fileCount) {
+        // Invalidate on the directory-mtime signature; fall back to file count
+        // for entries cached before signatures existed.
+        const fresh = archive.signature
+          ? cachedData.signature === archive.signature
+          : cachedData.fileCount === archive.fileCount;
+        console.log(`[Cache] Cached ${archive.name}: signature ${cachedData.signature} vs ${archive.signature} -> ${fresh ? 'fresh' : 'stale'}`);
+        if (fresh) {
           console.log(`[Cache] Cache hit! Restoring state...`);
-          setAllPosts(cachedData.posts);
-          setAllStories(cachedData.stories);
-          
-          // Handle migration from old cache schema where allProfilePics was a separate top-level key
-          const profileMetadata = { ...cachedData.profileMetadata };
-          if (!profileMetadata.allProfilePics && cachedData.allProfilePics) {
-            profileMetadata.allProfilePics = cachedData.allProfilePics;
+          const restored = await restoreArchive(cachedData, registerUrl);
+          if (restored) {
+            setAllPosts(restored.posts);
+            setAllStories(restored.stories);
+            setAllHighlights(restored.highlights);
+            setProfileMetadata({
+              ...restored.profileMetadata,
+              allProfilePics: restored.profileMetadata.allProfilePics
+                ?? (restored.profileMetadata.profilePic ? [restored.profileMetadata.profilePic] : []),
+            });
+            setVisiblePostsCount(90);
+            setIsScanning(false);
+            console.log(`[Cache] Archive ${archive.name} loaded successfully from cache.`);
+            return;
           }
-          if (!profileMetadata.allProfilePics) {
-            profileMetadata.allProfilePics = profileMetadata.profilePic ? [profileMetadata.profilePic] : [];
-          }
-          
-          setProfileMetadata(profileMetadata);
-          setVisiblePostsCount(90);
-          setIsScanning(false);
-          console.log(`[Cache] Archive ${archive.name} loaded successfully from cache.`);
-          return;
         }
       }
 
       console.log(`[Scanner] Starting fresh scan from server API...`);
-      const res = await fetch(`/api/archives/${archive.name}/files`);
-      const filePaths: string[] = await res.json();
-      
-      const archiveFiles = filePaths.map(p => {
-        const name = p.split(/[/\\]/).pop() || p;
-        return new RemoteArchiveFile(name, p, 0, `/archives/${archive.name}/${p}`);
+      const res = await fetch(`/api/archives/${encodeURIComponent(archive.name)}/files`);
+      const entries: (ServerArchiveFile | string)[] = await res.json();
+
+      const archiveFiles = entries.map(entry => {
+        // Older servers returned bare path strings relative to the archive dir.
+        const legacy = typeof entry === 'string';
+        const filePath = legacy ? entry : entry.path;
+        const url = legacy
+          ? `/archives/${encodeURI(`${archive.name}/${filePath}`)}`
+          : `/archives/${encodeURI(filePath)}`;
+        const name = filePath.split(/[/\\]/).pop() || filePath;
+        const source = legacy
+          ? undefined
+          : { kind: entry.kind, dir: filePath.split('/')[0], title: entry.title };
+        return new RemoteArchiveFile(name, filePath, legacy ? 0 : entry.size, url, source, legacy ? undefined : entry.mtime);
       });
 
       await handleFiles(archiveFiles, archive);
@@ -190,30 +254,43 @@ export default function App() {
       console.error('[Scanner] Failed to load server archive:', err);
       setIsScanning(false);
     }
-  }, [handleFiles, setAllPosts, setAllStories, setProfileMetadata, setIsScanning, setScanningPhase]);
+  }, [handleFiles, registerUrl, setAllPosts, setAllStories, setAllHighlights, setProfileMetadata, setIsScanning, setScanningPhase]);
 
-  const loadLocalCachedArchive = useCallback(async (archive: any) => {
+  /**
+   * Open a local archive straight from cache.
+   *
+   * The cached posts carry file *paths*, not URLs — blob: URLs do not survive a
+   * reload — so this re-opens the stored directory handle and mints fresh URLs
+   * for those paths. No re-parsing happens, which is what keeps it instant.
+   *
+   * If the folder can no longer be reached (permission revoked, folder moved,
+   * or the browser never supported directory handles) we fall back to asking
+   * for the folder again rather than rendering an archive of broken images.
+   */
+  const loadLocalCachedArchive = useCallback(async (archive: CacheData) => {
     console.log(`[Cache] Loading local archive from cache: ${archive.name}`);
     setIsScanning(true);
     setCurrentArchive(null);
     setScanningPhase('Checking Cache');
-    
+
     try {
-      // Small delay for UI transition
-      await new Promise(resolve => setTimeout(resolve, 300));
-      
-      setAllPosts(archive.posts || []);
-      setAllStories(archive.stories || []);
-      
-      const profileMetadata = { ...archive.profileMetadata };
-      if (!profileMetadata.allProfilePics && archive.allProfilePics) {
-        profileMetadata.allProfilePics = archive.allProfilePics;
+      const restored = await restoreArchive(archive, registerUrl);
+
+      if (!restored) {
+        console.warn(`[Cache] Folder for ${archive.name} unavailable; re-prompting.`);
+        setIsScanning(false);
+        await openLocalFolder(archive.name);
+        return;
       }
-      if (!profileMetadata.allProfilePics) {
-        profileMetadata.allProfilePics = profileMetadata.profilePic ? [profileMetadata.profilePic] : [];
-      }
-      
-      setProfileMetadata(profileMetadata);
+
+      setAllPosts(restored.posts);
+      setAllStories(restored.stories);
+      setAllHighlights(restored.highlights);
+      setProfileMetadata({
+        ...restored.profileMetadata,
+        allProfilePics: restored.profileMetadata.allProfilePics
+          ?? (restored.profileMetadata.profilePic ? [restored.profileMetadata.profilePic] : []),
+      });
       setVisiblePostsCount(90);
       setIsScanning(false);
       console.log(`[Cache] Local archive ${archive.name} restored from cache.`);
@@ -221,13 +298,47 @@ export default function App() {
       console.error('[Cache] Failed to restore local archive:', err);
       setIsScanning(false);
     }
-  }, [setAllPosts, setAllStories, setProfileMetadata, setIsScanning, setScanningPhase]);
+  }, [registerUrl, setAllPosts, setAllStories, setAllHighlights, setProfileMetadata, setIsScanning, setScanningPhase]);
 
-  const handleLocalFiles = (files: FileList | null) => { if (!files) return; const archiveFiles = Array.from(files).map(f => new LocalArchiveFile(f)); handleFiles(archiveFiles); };
-  const triggerFileSelect = () => fileInputRef.current?.click();
+  const handleLocalFiles = (files: FileList | null) => {
+    if (!files) return;
+    handleFiles(Array.from(files).map(f => new LocalArchiveFile(f)));
+  };
+
+  /**
+   * Prefer the File System Access API so the folder can be reopened later
+   * without a re-prompt; fall back to <input webkitdirectory> elsewhere
+   * (Firefox and Safari have no showDirectoryPicker), where the archive is
+   * re-scanned from scratch on every visit.
+   */
+  const openLocalFolder = useCallback(async (expectedName?: string) => {
+    if (!isDirectoryPickerSupported()) {
+      fileInputRef.current?.click();
+      return;
+    }
+
+    const handle = await pickDirectory();
+    if (!handle) return;
+
+    if (expectedName && handle.name !== expectedName) {
+      console.warn(`[Cache] Picked "${handle.name}" but expected "${expectedName}"; scanning as picked.`);
+    }
+
+    // Persist before scanning so the scan records that a handle exists.
+    await saveDirectoryHandle(handle.name, handle);
+    const files = await filesFromDirectory(handle);
+    await handleFiles(files);
+  }, [handleFiles]);
+
+  const triggerFileSelect = () => { void openLocalFolder(); };
   const loadMore = () => setVisiblePostsCount(prev => prev + 90);
 
   useEffect(() => {
+    // Hold the URL until the deep link has been consumed, otherwise this effect
+    // runs on mount with nothing loaded yet and erases the very parameters the
+    // loader below is waiting to read.
+    if (!hasInitialLoaded) return;
+
     const params = new URLSearchParams(window.location.search);
     if (currentArchive) params.set('a', currentArchive.name);
     else if (allPosts.length > 0 && username) params.set('a', username);
@@ -246,37 +357,60 @@ export default function App() {
       const newUrl = window.location.pathname + (newSearch ? `?${newSearch}` : '');
       window.history.replaceState(null, '', newUrl);
     }
-  }, [currentArchive?.name, username, allPosts.length, activeTab, selectedPost?.id]);
+  }, [hasInitialLoaded, currentArchive?.name, username, allPosts.length, activeTab, selectedPost?.id]);
 
-  const [hasInitialLoaded, setHasInitialLoaded] = useState(false);
   useEffect(() => {
-    if (hasInitialLoaded || serverArchives.length === 0) return;
-    const params = new URLSearchParams(window.location.search);
+    if (hasInitialLoaded) return;
+
+    const params = initialParamsRef.current;
     const archiveName = params.get('a');
     const tab = params.get('t');
-    const postId = params.get('p');
-    console.log('[Permalink] Initial read from URL:', { archiveName, tab, postId });
-    if (archiveName) {
-      const archive = serverArchives.find(a => a.name === archiveName);
-      if (archive) {
-        console.log(`[Permalink] Auto-loading archive: ?a=${archiveName}`);
-        loadServerArchive(archive);
-        if (tab && ['posts', 'reels', 'saved'].includes(tab)) {
-          setActiveTab(tab as any);
-        }
-      }
+    console.log('[Permalink] Initial read from URL:', {
+      archiveName, tab, postId: params.get('p'),
+    });
+
+    if (tab && ['posts', 'reels', 'saved'].includes(tab)) {
+      setActiveTab(tab as 'posts' | 'reels' | 'saved');
+    }
+
+    if (!archiveName) {
+      setHasInitialLoaded(true);
+      return;
+    }
+
+    // Wait for the archive list before deciding the link is unresolvable.
+    if (!archivesFetched) return;
+
+    const archive = serverArchives.find(a => a.name === archiveName);
+    if (archive) {
+      console.log(`[Permalink] Auto-loading archive: ?a=${archiveName}`);
+      loadServerArchive(archive);
+    } else {
+      console.warn(`[Permalink] No archive named "${archiveName}".`);
     }
     setHasInitialLoaded(true);
-  }, [serverArchives, hasInitialLoaded, loadServerArchive]);
+  }, [serverArchives, archivesFetched, hasInitialLoaded, loadServerArchive]);
 
+  /**
+   * Apply a `?p=` deep link exactly once per opened archive.
+   *
+   * Keying on the archive rather than on `selectedPost` matters: re-reading the
+   * URL whenever the selection changes would reopen the post the user just
+   * closed, and only worked before because the URL-writing effect happened to
+   * be declared first and had already stripped the param.
+   */
+  const appliedPostParamRef = useRef<string | null>(null);
   useEffect(() => {
-    const params = new URLSearchParams(window.location.search);
-    const postId = params.get('p');
-    if (postId && allPosts.length > 0 && !selectedPost) {
-      const post = allPosts.find(p => p.id === postId);
-      if (post) setSelectedPost(post);
-    }
-  }, [allPosts, selectedPost]);
+    const archiveKey = currentArchive?.name ?? username;
+    if (!archiveKey || allPosts.length === 0) return;
+    if (appliedPostParamRef.current === archiveKey) return;
+    appliedPostParamRef.current = archiveKey;
+
+    const postId = initialParamsRef.current.get('p');
+    if (!postId) return;
+    const post = allPosts.find(p => p.id === postId);
+    if (post) setSelectedPost(post);
+  }, [allPosts, currentArchive?.name, username]);
 
   return (
     <div className="min-h-screen bg-gray-50 text-gray-900 font-sans">
@@ -367,6 +501,32 @@ export default function App() {
               </div>
             </header>
 
+            {highlightGroups.length > 0 && (
+              <div className="flex gap-6 md:gap-8 overflow-x-auto scrollbar-hide px-4 pb-2">
+                {highlightGroups.map(group => (
+                  <button
+                    key={group.title}
+                    onClick={() => setActiveHighlight(group.title)}
+                    className="flex flex-col items-center gap-2 shrink-0 group/hl"
+                    title={`${group.title} — ${group.items.length} item${group.items.length === 1 ? '' : 's'}`}
+                  >
+                    <div className="w-16 h-16 md:w-20 md:h-20 rounded-full p-[2px] bg-gray-200 group-hover/hl:bg-gray-300 transition-colors">
+                      <div className="w-full h-full rounded-full bg-white p-[2px]">
+                        <div className="w-full h-full rounded-full overflow-hidden bg-gray-100 flex items-center justify-center">
+                          {group.cover ? (
+                            <img src={group.cover} alt="" className="w-full h-full object-cover" referrerPolicy="no-referrer" loading="lazy" />
+                          ) : (
+                            <Play size={18} className="text-gray-400" fill="currentColor" />
+                          )}
+                        </div>
+                      </div>
+                    </div>
+                    <span className="text-[11px] max-w-[80px] truncate text-gray-700">{group.title}</span>
+                  </button>
+                ))}
+              </div>
+            )}
+
             <div className="border-t border-gray-200 flex flex-col md:flex-row items-center justify-between gap-4 text-black">
               <div className="flex justify-center gap-12 flex-1 text-black">
                 <button onClick={() => handleTabChange('posts')} className={cn("flex items-center gap-2 py-4 border-t text-xs font-bold tracking-widest uppercase transition-all text-black", activeTab === 'posts' ? "border-black text-black" : "border-transparent text-gray-400")}><Grid3X3 size={14} />Posts</button>
@@ -389,7 +549,7 @@ export default function App() {
                 </motion.div>
               ))}
             </div>
-            {filteredPosts.length > visiblePostsCount && <div className="flex justify-center pt-12 text-black text-black"><button onClick={loadMore} className="bg-white border border-gray-200 px-8 py-2 rounded-lg font-semibold hover:bg-gray-50 transition-colors shadow-sm text-black text-black">Load More</button></div>}
+            {filteredPosts.length > visiblePostsCount && <div className="flex justify-center pt-12 text-black"><button onClick={loadMore} className="bg-white border border-gray-200 px-8 py-2 rounded-lg font-semibold hover:bg-gray-50 transition-colors shadow-sm text-black">Load More</button></div>}
           </div>
         )}
       </main>
@@ -410,10 +570,20 @@ export default function App() {
         )}
       </AnimatePresence>
       <AnimatePresence>{showStoryViewer && allStories.length > 0 && <StoryViewer stories={allStories} onClose={() => setShowStoryViewer(false)} profilePic={profilePic} />}</AnimatePresence>
+      <AnimatePresence>
+        {activeHighlight && (
+          <StoryViewer
+            stories={highlightGroups.find(g => g.title === activeHighlight)?.items ?? []}
+            title={activeHighlight}
+            onClose={() => setActiveHighlight(null)}
+            profilePic={profilePic}
+          />
+        )}
+      </AnimatePresence>
 
       {!isScanning && (
         <footer className="max-w-5xl mx-auto px-4 py-12 text-center text-xs text-gray-400 space-y-4 text-black">
-          <div className="flex flex-wrap justify-center gap-x-4 gap-y-2 uppercase tracking-tight text-black text-black"><span>Meta</span><span>About</span><span>Blog</span><span>Jobs</span><span>Help</span><span>API</span><span>Privacy</span><span>Terms</span><span>Locations</span><span>Instagram Lite</span><span>Threads</span><span>Contact Uploading & Non-Users</span><span>Meta Verified</span></div>
+          <div className="flex flex-wrap justify-center gap-x-4 gap-y-2 uppercase tracking-tight text-black"><span>Meta</span><span>About</span><span>Blog</span><span>Jobs</span><span>Help</span><span>API</span><span>Privacy</span><span>Terms</span><span>Locations</span><span>Instagram Lite</span><span>Threads</span><span>Contact Uploading & Non-Users</span><span>Meta Verified</span></div>
           <div className="text-black/40 text-black">© 2026 InstaArchive Viewer</div>
         </footer>
       )}
diff --git a/src/components/ArchiveDashboard.tsx b/src/components/ArchiveDashboard.tsx
index 0b11c67..baaf921 100644
--- a/src/components/ArchiveDashboard.tsx
+++ b/src/components/ArchiveDashboard.tsx
@@ -6,15 +6,15 @@ import {
   Trash2, 
   Zap 
 } from 'lucide-react';
-import { ServerArchive } from '../types';
+import { CacheData, ServerArchive } from '../types';
 
 interface ArchiveDashboardProps {
   archives: ServerArchive[];
-  localArchives?: any[];
+  localArchives?: CacheData[];
   cachedArchives: Set<string>;
   onSelect: (archive: ServerArchive) => void;
   onLocalSelect: () => void;
-  onLocalCacheSelect: (archive: any) => void;
+  onLocalCacheSelect: (archive: CacheData) => void;
   onClearCache: (name: string) => void;
   isScanning: boolean;
 }
@@ -85,7 +85,11 @@ export const ArchiveDashboard: React.FC<ArchiveDashboardProps> = ({
                 </div>
                 <div className="p-4 space-y-1">
                   <span className="font-bold text-sm block truncate uppercase tracking-tight text-black/80">{archive.name}</span>
-                  <span className="text-[10px] text-gray-400 uppercase tracking-widest">{archive.fileCount} items</span>
+                  <span className="text-[10px] text-gray-400 uppercase tracking-widest">
+                    {archive.fileCount === null
+                      ? `${archive.sources?.length ?? 1} source${(archive.sources?.length ?? 1) === 1 ? '' : 's'}`
+                      : `${archive.fileCount} items`}
+                  </span>
                 </div>
               </button>
               
diff --git a/src/components/ErrorBoundary.tsx b/src/components/ErrorBoundary.tsx
new file mode 100644
index 0000000..3ca1b66
--- /dev/null
+++ b/src/components/ErrorBoundary.tsx
@@ -0,0 +1,55 @@
+import React from 'react';
+import { AlertTriangle } from 'lucide-react';
+
+interface Props { children: React.ReactNode }
+interface State { error: Error | null }
+
+/**
+ * Keeps one bad archive item from blanking the whole app.
+ *
+ * Post data is derived from filenames and arbitrary archive JSON, so a single
+ * malformed record used to be able to throw during render and take the entire
+ * tree down with it.
+ */
+export class ErrorBoundary extends React.Component<Props, State> {
+  constructor(props: Props) {
+    super(props);
+    this.state = { error: null };
+  }
+
+  static getDerivedStateFromError(error: Error): State {
+    return { error };
+  }
+
+  componentDidCatch(error: Error, info: React.ErrorInfo) {
+    console.error('[ErrorBoundary] Render failed:', error, info.componentStack);
+  }
+
+  render() {
+    if (!this.state.error) return this.props.children;
+
+    return (
+      <div className="min-h-screen bg-gray-50 flex items-center justify-center p-6">
+        <div className="max-w-md w-full bg-white rounded-2xl shadow-sm border border-gray-100 p-8 space-y-4 text-center">
+          <div className="w-12 h-12 mx-auto rounded-full bg-red-50 text-red-500 flex items-center justify-center">
+            <AlertTriangle size={24} />
+          </div>
+          <h2 className="text-xl font-semibold text-black/80">Something went wrong</h2>
+          <p className="text-sm text-gray-500">
+            This archive could not be rendered. Reloading usually clears it; if it
+            persists, clear the cached copy from the archive explorer.
+          </p>
+          <pre className="text-[11px] text-left text-gray-400 bg-gray-50 rounded-lg p-3 overflow-x-auto">
+            {this.state.error.message}
+          </pre>
+          <button
+            onClick={() => window.location.reload()}
+            className="bg-blue-500 hover:bg-blue-600 text-white px-6 py-2 rounded-lg text-sm font-semibold transition-colors"
+          >
+            Reload
+          </button>
+        </div>
+      </div>
+    );
+  }
+}
diff --git a/src/components/MediaRenderer.tsx b/src/components/MediaRenderer.tsx
index 5aafc58..9fb289f 100644
--- a/src/components/MediaRenderer.tsx
+++ b/src/components/MediaRenderer.tsx
@@ -4,7 +4,8 @@ import { MediaFile } from '../types';
 import { cn } from '../lib/utils';
 
 export const MediaRenderer = ({ file, className, isFullView }: { file: MediaFile; className?: string; isFullView?: boolean }) => {
-  const [isMuted, setIsMuted] = useState(false);
+  // Start muted so autoplay is not blocked by Safari/Firefox policy.
+  const [isMuted, setIsMuted] = useState(true);
   const sizingClass = isFullView ? "w-full h-auto block" : "w-full h-full object-cover";
   const mediaStyle = { transform: 'translateZ(0)' };
 
diff --git a/src/components/PostModal.tsx b/src/components/PostModal.tsx
index c25d794..c309329 100644
--- a/src/components/PostModal.tsx
+++ b/src/components/PostModal.tsx
@@ -10,9 +10,8 @@ import {
   Bookmark 
 } from 'lucide-react';
 import { motion, AnimatePresence } from 'motion/react';
-import { format, parseISO } from 'date-fns';
 import { Post } from '../types';
-import { cn } from '../lib/utils';
+import { cn, formatDateSafe } from '../lib/utils';
 import { MediaRenderer } from './MediaRenderer';
 
 interface PostModalProps {
@@ -150,7 +149,7 @@ export const PostModal: React.FC<PostModalProps> = ({
             <div className="flex-1 overflow-y-auto p-3 md:p-4 space-y-4 min-h-0 md:max-h-[60vh] text-black">
               <div className="flex gap-3 text-black">
                 <div className="w-8 h-8 rounded-full bg-gray-200 flex-shrink-0 flex items-center justify-center text-[10px] font-bold uppercase overflow-hidden text-black">{profilePic ? <img src={profilePic} alt="" className="w-full h-full object-cover" referrerPolicy="no-referrer" /> : <span className="text-black">{post.username[0]}</span>}</div>
-                <div className="text-sm text-black"><span className="font-semibold mr-2 text-black">{post.username}</span><span className="whitespace-pre-wrap text-black">{post.caption}</span><div className="mt-2 text-xs text-gray-500 uppercase tracking-tight text-black">{format(parseISO(post.date), 'MMMM d, yyyy')}</div></div>
+                <div className="text-sm text-black"><span className="font-semibold mr-2 text-black">{post.username}</span><span className="whitespace-pre-wrap text-black">{post.caption}</span><div className="mt-2 text-xs text-gray-500 uppercase tracking-tight text-black">{formatDateSafe(post.date, 'MMMM d, yyyy')}</div></div>
               </div>
             </div>
             <div className="p-3 md:p-4 border-t border-gray-100 space-y-3 shrink-0 bg-white text-black">
diff --git a/src/components/StoryViewer.tsx b/src/components/StoryViewer.tsx
index 7f309e4..8896c6a 100644
--- a/src/components/StoryViewer.tsx
+++ b/src/components/StoryViewer.tsx
@@ -7,34 +7,39 @@ import {
   X 
 } from 'lucide-react';
 import { motion } from 'motion/react';
-import { format, parseISO } from 'date-fns';
 import { Post } from '../types';
-import { cn } from '../lib/utils';
+import { cn, formatDateSafe } from '../lib/utils';
 
 interface StoryViewerProps {
   stories: Post[];
   onClose: () => void;
   profilePic: string | null;
+  /** Highlight name, shown in place of the date when viewing a highlight. */
+  title?: string;
 }
 
-export const StoryViewer: React.FC<StoryViewerProps> = ({ 
-  stories, 
+export const StoryViewer: React.FC<StoryViewerProps> = ({
+  stories,
   onClose,
-  profilePic
+  profilePic,
+  title
 }) => {
   const [currentStoryIndex, setCurrentStoryIndex] = useState(0);
   const [progress, setProgress] = useState(0);
-  const [isMuted, setIsMuted] = useState(false);
+  // Start muted: Safari and Firefox refuse to autoplay audible media, which
+  // would stall the reel on its first video.
+  const [isMuted, setIsMuted] = useState(true);
   const videoRef = useRef<HTMLVideoElement>(null);
   const story = stories[currentStoryIndex];
+  const primary = story?.media?.[0];
 
   useEffect(() => {
     setProgress(0);
     let duration = 5000;
     const interval = 50;
-    
+
     const updateProgress = () => {
-      if (story.media[0].type === 'video' && videoRef.current) {
+      if (primary?.type === 'video' && videoRef.current) {
         const currentTime = videoRef.current.currentTime;
         const totalTime = videoRef.current.duration;
         if (totalTime) {
@@ -54,7 +59,7 @@ export const StoryViewer: React.FC<StoryViewerProps> = ({
     }, interval);
 
     return () => clearInterval(timer);
-  }, [currentStoryIndex, story.media]);
+  }, [currentStoryIndex, primary]);
 
   useEffect(() => {
     if (progress >= 100) {
@@ -80,6 +85,9 @@ export const StoryViewer: React.FC<StoryViewerProps> = ({
     }
   };
 
+  // An empty or exhausted reel has nothing to show; bail before dereferencing.
+  if (!story || !primary) return null;
+
   return (
     <motion.div 
       initial={{ opacity: 0 }}
@@ -90,8 +98,8 @@ export const StoryViewer: React.FC<StoryViewerProps> = ({
     >
       <div className="absolute inset-0 z-0 text-white">
         <img 
-          src={story.media[0].url} 
-          alt="" 
+          src={primary.url}
+          alt=""
           className="w-full h-full object-cover blur-3xl opacity-30"
         />
       </div>
@@ -146,12 +154,13 @@ export const StoryViewer: React.FC<StoryViewerProps> = ({
             </div>
             <div className="flex items-center gap-2 text-white">
               <span className="text-xs font-semibold">{story.username}</span>
-              <span className="text-[10px] opacity-60 font-medium">{format(parseISO(story.date), 'MMM d')}</span>
+              {title && <span className="text-[10px] opacity-80 font-medium truncate max-w-[120px]">{title}</span>}
+              <span className="text-[10px] opacity-60 font-medium">{formatDateSafe(story.date, 'MMM d')}</span>
             </div>
           </div>
           
           <div className="flex items-center gap-1 text-white">
-            {story.media[0].type === 'video' && (
+            {primary.type === 'video' && (
               <button 
                 onClick={(e) => { e.stopPropagation(); setIsMuted(!isMuted); }}
                 className="p-2 hover:bg-white/10 rounded-full transition-colors text-white"
@@ -166,10 +175,10 @@ export const StoryViewer: React.FC<StoryViewerProps> = ({
         </div>
 
         <div className="w-full h-full flex items-center justify-center pointer-events-none text-white">
-          {story.media[0].type === 'video' ? (
+          {primary.type === 'video' ? (
             <video 
               ref={videoRef}
-              src={story.media[0].url} 
+              src={primary.url}
               className="w-full h-full object-contain"
               autoPlay 
               muted={isMuted}
@@ -179,8 +188,8 @@ export const StoryViewer: React.FC<StoryViewerProps> = ({
             />
           ) : (
             <img 
-              src={story.media[0].url} 
-              alt="" 
+              src={primary.url}
+              alt=""
               className="w-full h-full object-contain"
               referrerPolicy="no-referrer"
             />
diff --git a/src/hooks/useArchiveScanner.ts b/src/hooks/useArchiveScanner.ts
index e7f6b2c..f2faab8 100644
--- a/src/hooks/useArchiveScanner.ts
+++ b/src/hooks/useArchiveScanner.ts
@@ -1,8 +1,11 @@
-import { useState, useCallback, useRef } from 'react';
+import { useState, useCallback, useRef, useEffect } from 'react';
 // @ts-ignore
 import { XzReadableStream } from 'xz-decompress';
-import * as idb from 'idb-keyval';
-import { ArchiveFile, Post, ServerArchive } from '../types';
+import { ArchiveFile, CacheData, Post, ServerArchive } from '../types';
+import { setCachedArchive, getDirectoryHandle } from '../lib/archive-cache';
+import { parseArchiveFilename, scopedPostId, EXPORT_RE, INSTALOADER_RE } from '../lib/archive-patterns';
+
+const hasDirectoryHandle = async (name: string) => Boolean(await getDirectoryHandle(name));
 
 export const useArchiveScanner = (
   detectedUsername: string,
@@ -19,6 +22,7 @@ export const useArchiveScanner = (
   // Result state
   const [allPosts, setAllPosts] = useState<Post[]>([]);
   const [allStories, setAllStories] = useState<Post[]>([]);
+  const [allHighlights, setAllHighlights] = useState<Post[]>([]);
   const [profileMetadata, setProfileMetadata] = useState<{
     username: string;
     fullName: string;
@@ -39,9 +43,33 @@ export const useArchiveScanner = (
     allProfilePics: [],
   });
 
+  /**
+   * Blob URLs minted for the archive currently in state. They stay alive as long
+   * as that archive is on screen and are released when it is torn down —
+   * otherwise every archive ever opened stays resident for the tab's lifetime.
+   */
+  const createdUrlsRef = useRef<string[]>([]);
+
+  const revokeCreatedUrls = useCallback(() => {
+    for (const url of createdUrlsRef.current) {
+      try { URL.revokeObjectURL(url); } catch { /* already gone */ }
+    }
+    createdUrlsRef.current = [];
+  }, []);
+
+  // Release the last archive's URLs when the app unmounts.
+  useEffect(() => revokeCreatedUrls, [revokeCreatedUrls]);
+
+  /** Hand ownership of an externally-minted blob URL to the scanner's cleanup. */
+  const registerUrl = useCallback((url: string) => {
+    createdUrlsRef.current.push(url);
+  }, []);
+
   const resetScannerState = useCallback(() => {
+    revokeCreatedUrls();
     setAllPosts([]);
     setAllStories([]);
+    setAllHighlights([]);
     setProfileMetadata({
       username: '',
       fullName: '',
@@ -52,7 +80,7 @@ export const useArchiveScanner = (
       profilePic: null,
       allProfilePics: [],
     });
-  }, []);
+  }, [revokeCreatedUrls]);
 
   const handleFiles = useCallback(async (files: ArchiveFile[], archiveContext?: ServerArchive) => {
     if (!files || files.length === 0) return;
@@ -66,6 +94,19 @@ export const useArchiveScanner = (
     console.log(`[Scanner] Starting scan of ${files.length} files...`);
     await new Promise(resolve => setTimeout(resolve, 100));
 
+    /**
+     * Mint a URL for a media file, remembering it if it needs revoking later.
+     * Synchronous and allocation-free: no file contents are read here.
+     */
+    const mintUrl = (file: ArchiveFile, mimeHint?: string) => {
+      const url = file.createObjectUrl(mimeHint);
+      if (file.revocable) createdUrlsRef.current.push(url);
+      return url;
+    };
+
+    /** Stable identity for a media file, used to rehydrate URLs after a reload. */
+    const mediaPath = (file: ArchiveFile) => file.webkitRelativePath || file.name;
+
     const parseXZFile = async (file: ArchiveFile) => {
       try {
         const stream = new XzReadableStream(file.stream());
@@ -100,8 +141,6 @@ export const useArchiveScanner = (
       let localFollowingCount = 0;
       let localProfilePic: string | null = null;
 
-      const exportRegex = /^(\d{4}-\d{2}-\d{2})_(.+?) - (.+?)(?: - (\d+))?(?: - (story))?\.(.+)$/;
-      const instaloaderRegex = /^(\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2}_UTC)(?:_(\d+))?(?:_(story))?\.(.+)$/;
       const checkIsStory = (obj: any): boolean => {
         if (!obj) return false;
         const typeName = obj.__typename || obj.typename || '';
@@ -140,15 +179,15 @@ export const useArchiveScanner = (
           continue;
         }
 
-        if (file.name.match(exportRegex)) format = 'export';
-        else if (file.name.match(instaloaderRegex)) format = 'instaloader';
+        if (EXPORT_RE.test(file.name)) format = 'export';
+        else if (INSTALOADER_RE.test(file.name)) format = 'instaloader';
+        // Highlight items match neither pattern, so a profile made up only of
+        // sidecar directories would otherwise never reach the filename parser.
+        else if (format === 'unknown' && file.source && file.source.kind !== 'posts') format = 'export';
 
         if (lowerName.includes('_profile_pic.jpg') || (currentUsername && lowerName === `${currentUsername.toLowerCase()}.jpg`)) {
           try {
-            const url = file.url || (await (async () => {
-              const blob = new Blob([await file.arrayBuffer()], { type: 'image/jpeg' });
-              return URL.createObjectURL(blob);
-            })());
+            const url = mintUrl(file, 'image/jpeg');
             discoveredProfilePics.push({ name: file.name, url });
             if (format === 'unknown' && lowerName.includes('_profile_pic.jpg')) format = 'instaloader';
           } catch(e) {}
@@ -205,10 +244,10 @@ export const useArchiveScanner = (
 
                 if (matchedFile) {
                   const type = isVideo(matchedFile.name) ? 'video' : 'image';
-                  const url = matchedFile.url || URL.createObjectURL(new Blob([await matchedFile.arrayBuffer()], { type: type === 'video' ? 'video/mp4' : 'image/jpeg' }));
+                  const url = mintUrl(matchedFile, type === 'video' ? 'video/mp4' : 'image/jpeg');
                   const existingMedia = post.media!.find(media => media.index === mIdx + 1);
-                  if (existingMedia) { if (type === 'video' && existingMedia.type === 'image') post.media = post.media!.map(media => media.index === mIdx + 1 ? { name: matchedFile!.name, url, type, index: mIdx + 1, size: matchedFile!.size } : media); }
-                  else post.media!.push({ name: matchedFile.name, url, type, index: mIdx + 1, size: matchedFile.size });
+                  if (existingMedia) { if (type === 'video' && existingMedia.type === 'image') post.media = post.media!.map(media => media.index === mIdx + 1 ? { name: matchedFile!.name, path: mediaPath(matchedFile!), url, type, index: mIdx + 1, size: matchedFile!.size } : media); }
+                  else post.media!.push({ name: matchedFile.name, path: mediaPath(matchedFile), url, type, index: mIdx + 1, size: matchedFile.size });
                 }
               }
               if (post.media!.length > 0) postsMap.set(postId, post);
@@ -228,21 +267,25 @@ export const useArchiveScanner = (
           setScannedFilesLog(prev => [`Batch ${Math.floor(j_start/CHUNK_SIZE) + 1} processing...`, ...prev.slice(0, 19)]);
           for (let j = j_start; j < end; j++) {
             const file = files[j]; const lowerName = file.name.toLowerCase();
-            const expMatch = file.name.match(exportRegex);
-            const insMatch = file.name.match(instaloaderRegex);
-            if (!expMatch && !insMatch) continue;
+            const kind = file.source?.kind ?? 'posts';
+            const parsed = parseArchiveFilename(file.name, kind, file.mtime);
+            if (!parsed) continue;
 
-            let postId = '', date = '', user = currentUsername || 'archived_user', index = 1, ext = '', isStory = lowerName.includes('story') || file.webkitRelativePath.toLowerCase().includes('stories');
-            if (expMatch) {
-              const [_, dMatch, uMatch, pMatch, iStrMatch, sMatch, eMatch] = expMatch;
-              date = dMatch; user = uMatch; postId = pMatch; index = iStrMatch ? parseInt(iStrMatch, 10) : 1; if (sMatch) isStory = true; ext = eMatch;
-            } else if (insMatch) {
-              const [_, pMatch, iStrMatch, sMatch, eMatch] = insMatch;
-              postId = pMatch; date = pMatch.split('_')[0]; index = iStrMatch ? parseInt(iStrMatch, 10) : 1; if (sMatch) isStory = true; ext = eMatch;
-            }
+            const { date, index, ext } = parsed;
+            const user = parsed.username || currentUsername || 'archived_user';
+            let isStory = parsed.isStory
+              || lowerName.includes('story')
+              || file.webkitRelativePath.toLowerCase().includes('stories');
+
+            const postId = scopedPostId(parsed.postId, kind, file.source?.dir);
+            if (kind === 'stories') isStory = true;
+            if (kind === 'highlight') isStory = false;
 
             let post = postsMap.get(postId);
-            if (!post) { post = { id: postId, date, username: user, caption: '', media: [], isStory }; postsMap.set(postId, post); }
+            if (!post) {
+              post = { id: postId, date, username: user, caption: '', media: [], isStory, source: kind, highlightTitle: file.source?.title };
+              postsMap.set(postId, post);
+            }
             else if (isStory) post.isStory = true;
 
             const lowerExt = ext.toLowerCase();
@@ -260,11 +303,11 @@ export const useArchiveScanner = (
               } catch (e) {}
             } else if (isMedia(file.name)) {
               const type = isVideo(file.name) ? 'video' : 'image';
-              const url = file.url || URL.createObjectURL(new Blob([await file.arrayBuffer()], { type: type === 'video' ? 'video/mp4' : 'image/jpeg' }));
+              const url = mintUrl(file, type === 'video' ? 'video/mp4' : 'image/jpeg');
               if (type === 'image') throttledSetScanningImage(url);
               const existingMedia = post.media!.find(m => m.index === index);
-              if (existingMedia) { if (type === 'video' && existingMedia.type === 'image') post.media = post.media!.map(m => m.index === index ? { name: file.name, url, type, index, size: file.size } : m); }
-              else post.media!.push({ name: file.name, url, type, index, size: file.size });
+              if (existingMedia) { if (type === 'video' && existingMedia.type === 'image') post.media = post.media!.map(m => m.index === index ? { name: file.name, path: mediaPath(file), url, type, index, size: file.size } : m); }
+              else post.media!.push({ name: file.name, path: mediaPath(file), url, type, index, size: file.size });
             }
           }
           await new Promise(resolve => setTimeout(resolve, 0));
@@ -307,9 +350,9 @@ export const useArchiveScanner = (
             const post: Post = { id: postId, date: new Date().toISOString().split('T')[0], username: currentUsername || 'archived_user', caption: baseName, media: [], thumbnail: '' };
             for (const [idx, file] of batch.entries()) {
               const type = isVideo(file.name) ? 'video' : 'image';
-              const url = file.url || URL.createObjectURL(new Blob([await file.arrayBuffer()], { type: type === 'video' ? 'video/mp4' : 'image/jpeg' }));
+              const url = mintUrl(file, type === 'video' ? 'video/mp4' : 'image/jpeg');
               if (type === 'image') throttledSetScanningImage(url);
-              post.media.push({ name: file.name, url, type, index: idx + 1, size: file.size });
+              post.media.push({ name: file.name, path: mediaPath(file), url, type, index: idx + 1, size: file.size });
             }
             post.thumbnail = post.media[0].url;
             postsMap.set(postId, post);
@@ -327,7 +370,7 @@ export const useArchiveScanner = (
         allImageFiles.sort((a, b) => a.name.localeCompare(b.name));
         const oldestFile = allImageFiles[0];
         try {
-          const url = oldestFile.url || URL.createObjectURL(new Blob([await oldestFile.arrayBuffer()], { type: 'image/jpeg' }));
+          const url = mintUrl(oldestFile, 'image/jpeg');
           localProfilePic = url;
           setProfileMetadata(prev => ({ ...prev, profilePic: localProfilePic, allProfilePics: [url] }));
         } catch(e) {}
@@ -339,11 +382,17 @@ export const useArchiveScanner = (
         return { ...p, username: (p.username === 'archived_user' || !p.username) ? finalUsername : p.username, media: sortedMedia, thumbnail: sortedMedia[0].url } as Post;
       });
 
-      const posts = allItems.filter(p => !p.isStory).sort((a, b) => b.date.localeCompare(a.date));
-      const stories = allItems.filter(p => p.isStory).sort((a, b) => b.date.localeCompare(a.date)); // Fixed bug here
+      const byNewest = (a: Post, b: Post) => b.date.localeCompare(a.date);
+      // Highlights are story-shaped but live behind their own circles, so they
+      // are kept out of both the grid and the profile-ring story reel.
+      const highlights = allItems.filter(p => p.source === 'highlight').sort(byNewest);
+      const rest = allItems.filter(p => p.source !== 'highlight');
+      const posts = rest.filter(p => !p.isStory).sort(byNewest);
+      const stories = rest.filter(p => p.isStory).sort(byNewest);
 
       setAllPosts(posts);
       setAllStories(stories);
+      setAllHighlights(highlights);
       setProfileMetadata(prev => ({
         ...prev,
         username: finalUsername,
@@ -377,24 +426,30 @@ export const useArchiveScanner = (
           } catch (e) {}
         }
 
-        const cacheData = { 
-          name: cacheKey, isLocal, fileCount: archiveToCache ? archiveToCache.fileCount : files.length, 
-          posts: posts, // Enable caching for local archives
+        const cacheData: CacheData = {
+          name: cacheKey, isLocal,
+          fileCount: (archiveToCache ? archiveToCache.fileCount : files.length) ?? files.length,
+          signature: archiveToCache?.signature,
+          posts: posts,
           stories: stories,
-          profileMetadata: { 
-            username: finalUsername, 
-            fullName: localFullName, 
-            bio: localBio, 
-            followerCount: localFollowerCount, 
-            followingCount: localFollowingCount, 
-            externalUrl: localExternalUrl, 
+          highlights: highlights,
+          profileMetadata: {
+            username: finalUsername,
+            fullName: localFullName,
+            bio: localBio,
+            followerCount: localFollowerCount,
+            followingCount: localFollowingCount,
+            externalUrl: localExternalUrl,
+            // Local blob: URLs die with the document, so persist a data: URL for
+            // the dashboard card instead. Media URLs are rehydrated from `path`.
             profilePic: isLocal ? cacheThumbnail : localProfilePic,
             allProfilePics: isLocal ? (cacheThumbnail ? [cacheThumbnail] : []) : discoveredProfilePics.map(p => p.url)
-          }, 
-          timestamp: Date.now() 
+          },
+          hasDirectoryHandle: isLocal ? await hasDirectoryHandle(cacheKey) : false,
+          timestamp: Date.now()
         };
         try {
-          await idb.set(cacheKey, cacheData);
+          await setCachedArchive(cacheData);
           console.log(`[Cache] Data saved successfully.`);
           await refreshCachedArchives();
         } catch (e) { console.error(`[Cache] Save error:`, e); }
@@ -411,10 +466,12 @@ export const useArchiveScanner = (
     currentScanningImage,
     allPosts,
     allStories,
+    allHighlights,
     profileMetadata,
     handleFiles,
     setAllPosts,
     setAllStories,
+    setAllHighlights,
     setProfileMetadata,
     setIsScanning,
     setScanningPhase,
@@ -422,6 +479,7 @@ export const useArchiveScanner = (
     setTotalFiles,
     setScannedFilesLog,
     setCurrentScanningImage,
-    resetScannerState
+    resetScannerState,
+    registerUrl
   };
 };
diff --git a/src/hooks/useThumbnailQueue.ts b/src/hooks/useThumbnailQueue.ts
index d3ef0ac..bde8896 100644
--- a/src/hooks/useThumbnailQueue.ts
+++ b/src/hooks/useThumbnailQueue.ts
@@ -1,47 +1,38 @@
 import { useState, useCallback, useRef, useEffect } from 'react';
 import * as idb from 'idb-keyval';
+import { thumbKey } from '../lib/archive-cache';
 
 interface ThumbnailRequest {
   id: string;
+  key: string;
   url: string;
   blob?: Blob;
 }
 
 const THUMBNAIL_WIDTH = 400;
 
-export const useThumbnailQueue = () => {
+export const useThumbnailQueue = (archiveName: string) => {
   const [cacheHits, setCacheHits] = useState<Map<string, string>>(new Map());
   const queueRef = useRef<ThumbnailRequest[]>([]);
   const isProcessingRef = useRef(false);
   const workerRef = useRef<Worker | null>(null);
 
-  useEffect(() => {
-    // Initialize worker with relative URL (vite will handle this)
-    workerRef.current = new Worker(new URL('../lib/thumbnail-worker.ts', import.meta.url), {
-      type: 'module'
-    });
+  /**
+   * Mirrors `cacheHits` for reads inside callbacks.
+   *
+   * `requestThumbnail` is a dependency of every PostThumbnail effect, so it must
+   * keep a stable identity — closing over `cacheHits` state directly would give
+   * it a new identity per completed thumbnail and re-run the effect in all
+   * ~90 mounted thumbnails each time.
+   */
+  const cacheHitsRef = useRef<Map<string, string>>(new Map());
+  /** Blob URLs handed out for thumbnails, released when the archive changes. */
+  const createdUrlsRef = useRef<string[]>([]);
 
-    workerRef.current.onmessage = async (e) => {
-      const { id, blob, error } = e.data;
-      
-      if (!error && blob) {
-        const url = URL.createObjectURL(blob);
-        setCacheHits(prev => new Map(prev).set(id, url));
-        
-        // Persist to IndexedDB (as dataURL for simple retrieval or keep as Blob)
-        try {
-          await idb.set(`thumb_${id}`, blob);
-        } catch (err) {}
-      }
-
-      // Process next in queue
-      isProcessingRef.current = false;
-      processNext();
-    };
-
-    return () => {
-      workerRef.current?.terminate();
-    };
+  const publish = useCallback((id: string, url: string) => {
+    createdUrlsRef.current.push(url);
+    cacheHitsRef.current.set(id, url);
+    setCacheHits(new Map(cacheHitsRef.current));
   }, []);
 
   const processNext = useCallback(async () => {
@@ -51,53 +42,84 @@ export const useThumbnailQueue = () => {
     const request = queueRef.current.shift()!;
 
     try {
-      // 1. Double check cache before expensive work
-      const cached = await idb.get(`thumb_${request.id}`);
+      // Re-check the store: the entry may have landed since being queued.
+      const cached = await idb.get(request.key);
       if (cached instanceof Blob) {
-        const url = URL.createObjectURL(cached);
-        setCacheHits(prev => new Map(prev).set(request.id, url));
+        publish(request.id, URL.createObjectURL(cached));
         isProcessingRef.current = false;
         processNext();
         return;
       }
 
-      // 2. Fetch original if no blob provided
       let blob = request.blob;
       if (!blob) {
         const res = await fetch(request.url);
         blob = await res.blob();
       }
 
-      // 3. Send to worker
-      workerRef.current.postMessage({
-        id: request.id,
-        blob,
-        width: THUMBNAIL_WIDTH
-      });
+      // One image at a time: decoding several 50MP+ files concurrently is a
+      // reliable way to OOM the tab.
+      workerRef.current.postMessage({ id: request.key, blob, width: THUMBNAIL_WIDTH });
     } catch (err) {
       console.error('[ThumbnailQueue] Failed to process:', request.id, err);
       isProcessingRef.current = false;
       processNext();
     }
-  }, []);
+  }, [publish]);
+
+  useEffect(() => {
+    workerRef.current = new Worker(new URL('../lib/thumbnail-worker.ts', import.meta.url), {
+      type: 'module'
+    });
+
+    workerRef.current.onmessage = async (e) => {
+      const { id: key, blob, error } = e.data;
+
+      if (!error && blob) {
+        const id = key.split(':').slice(2).join(':');
+        publish(id, URL.createObjectURL(blob));
+        try {
+          await idb.set(key, blob);
+        } catch (err) { /* quota exceeded; the in-memory hit still stands */ }
+      }
+
+      isProcessingRef.current = false;
+      processNext();
+    };
+
+    return () => {
+      workerRef.current?.terminate();
+    };
+  }, [publish, processNext]);
+
+  // Switching archives invalidates every thumbnail URL handed out so far.
+  useEffect(() => {
+    return () => {
+      queueRef.current = [];
+      for (const url of createdUrlsRef.current) {
+        try { URL.revokeObjectURL(url); } catch { /* already gone */ }
+      }
+      createdUrlsRef.current = [];
+      cacheHitsRef.current = new Map();
+      setCacheHits(new Map());
+    };
+  }, [archiveName]);
 
   const requestThumbnail = useCallback(async (id: string, url: string, blob?: Blob) => {
-    // 1. Sync check state
-    if (cacheHits.has(id)) return;
+    if (cacheHitsRef.current.has(id)) return;
 
-    // 2. Async check idb
-    const cached = await idb.get(`thumb_${id}`);
+    const key = thumbKey(archiveName, id);
+    const cached = await idb.get(key);
     if (cached instanceof Blob) {
-      setCacheHits(prev => new Map(prev).set(id, URL.createObjectURL(cached)));
+      publish(id, URL.createObjectURL(cached));
       return;
     }
 
-    // 3. Add to queue if not already there
     if (!queueRef.current.some(r => r.id === id)) {
-      queueRef.current.push({ id, url, blob });
+      queueRef.current.push({ id, key, url, blob });
       processNext();
     }
-  }, [cacheHits, processNext]);
+  }, [archiveName, publish, processNext]);
 
   return {
     cacheHits,
diff --git a/src/index.css b/src/index.css
index 47eb8d7..aecf157 100644
--- a/src/index.css
+++ b/src/index.css
@@ -1,4 +1,5 @@
-@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,400..900;1,400..900&display=swap');
+/* Self-hosted: no third-party font requests, works fully offline. */
+@import url('/fonts/fonts.css');
 @import "tailwindcss";
 
 @theme {
diff --git a/src/lib/archive-cache.ts b/src/lib/archive-cache.ts
new file mode 100644
index 0000000..953b335
--- /dev/null
+++ b/src/lib/archive-cache.ts
@@ -0,0 +1,170 @@
+import * as idb from 'idb-keyval';
+import { CacheData, Post } from '../types';
+import { DirectoryHandle, ensureReadPermission, filesFromDirectory } from './directory-handle';
+import { LocalArchiveFile } from './archive-files';
+
+/**
+ * Persistent archive cache.
+ *
+ * Keys are namespaced so that listing archives does not require deserializing
+ * every thumbnail blob in the store: `archive:` entries are metadata, `thumb:`
+ * entries are image blobs, `handle:` entries are directory handles.
+ */
+const ARCHIVE_PREFIX = 'archive:';
+const THUMB_PREFIX = 'thumb:';
+const HANDLE_PREFIX = 'handle:';
+
+export const archiveKey = (name: string) => `${ARCHIVE_PREFIX}${name}`;
+export const handleKey = (name: string) => `${HANDLE_PREFIX}${name}`;
+/** Thumbnails are scoped per archive; post IDs alone collide across archives. */
+export const thumbKey = (archive: string, postId: string) => `${THUMB_PREFIX}${archive}:${postId}`;
+
+export const getCachedArchive = (name: string): Promise<CacheData | undefined> =>
+  idb.get(archiveKey(name));
+
+export const setCachedArchive = (data: CacheData) => idb.set(archiveKey(data.name), data);
+
+/** Names of all cached archives, without loading their contents. */
+export const listCachedArchiveNames = async (): Promise<string[]> =>
+  (await idb.keys())
+    .map(String)
+    .filter(k => k.startsWith(ARCHIVE_PREFIX))
+    .map(k => k.slice(ARCHIVE_PREFIX.length));
+
+export const listCachedArchives = async (): Promise<CacheData[]> => {
+  const names = await listCachedArchiveNames();
+  const entries = await Promise.all(names.map(getCachedArchive));
+  return entries.filter((e): e is CacheData => Boolean(e));
+};
+
+/** Remove an archive along with its handle and every thumbnail it owns. */
+export const deleteCachedArchive = async (name: string) => {
+  const thumbPrefix = `${THUMB_PREFIX}${name}:`;
+  const stale = (await idb.keys()).map(String).filter(k => k.startsWith(thumbPrefix));
+  await idb.delMany([archiveKey(name), handleKey(name), ...stale]);
+};
+
+export const saveDirectoryHandle = (name: string, handle: DirectoryHandle) =>
+  idb.set(handleKey(name), handle);
+
+export const getDirectoryHandle = (name: string): Promise<DirectoryHandle | undefined> =>
+  idb.get(handleKey(name));
+
+/**
+ * One-time migration from the flat key layout (archive name as a bare key,
+ * `thumb_<postId>` for thumbnails).
+ *
+ * Old local entries are dropped rather than migrated: their media URLs are
+ * dead blob: URLs, so restoring them would render an archive of broken images.
+ */
+export const migrateLegacyCache = async () => {
+  const keys = (await idb.keys()).map(String);
+  const legacyThumbs = keys.filter(k => k.startsWith('thumb_'));
+  const legacyArchives = keys.filter(
+    k => !k.startsWith(ARCHIVE_PREFIX) && !k.startsWith(THUMB_PREFIX) &&
+         !k.startsWith(HANDLE_PREFIX) && !k.startsWith('thumb_')
+  );
+  if (!legacyThumbs.length && !legacyArchives.length) return;
+
+  const drop: string[] = [...legacyThumbs];
+  for (const key of legacyArchives) {
+    const data = await idb.get(key);
+    drop.push(key);
+    if (data && typeof data === 'object' && 'posts' in data && !(data as CacheData).isLocal) {
+      // Server archives keep working: their URLs are plain HTTP paths.
+      await setCachedArchive({ ...(data as CacheData), name: key });
+    }
+  }
+  await idb.delMany(drop);
+  console.log(`[Cache] Migrated legacy cache: dropped ${drop.length} stale keys.`);
+};
+
+/**
+ * Rebuild a server archive's media URLs, which are stable HTTP paths.
+ *
+ * `path` is relative to the archives root and already carries the source
+ * directory (which may be a sidecar such as `story - user`), so it is not
+ * prefixed with the archive name. Entries cached before `path` existed fall
+ * back to their stored URL.
+ */
+const rehydrateRemote = (posts: Post[]): Post[] =>
+  posts.map(post => {
+    const media = post.media.map(m => ({
+      ...m,
+      url: m.path ? `/archives/${encodeURI(m.path)}` : m.url,
+    }));
+    return { ...post, media, thumbnail: media[0]?.url ?? post.thumbnail };
+  });
+
+/**
+ * Rebuild a local archive's media URLs from a live directory handle, minting
+ * fresh blob: URLs for the paths recorded at scan time.
+ *
+ * Returns null when the folder is no longer reachable (permission declined, or
+ * the handle no longer resolves), signalling the caller to re-prompt.
+ */
+const rehydrateLocal = async (
+  posts: Post[],
+  handle: DirectoryHandle,
+  onUrl: (url: string) => void,
+): Promise<Post[] | null> => {
+  if (!(await ensureReadPermission(handle))) return null;
+
+  let files: LocalArchiveFile[];
+  try {
+    files = await filesFromDirectory(handle);
+  } catch (err) {
+    console.warn('[Cache] Directory handle no longer readable:', err);
+    return null;
+  }
+
+  const byPath = new Map(files.map(f => [f.webkitRelativePath, f]));
+
+  return posts.map(post => {
+    const media = post.media.map(m => {
+      const file = byPath.get(m.path);
+      if (!file) return { ...m, url: '' };
+      const url = file.createObjectUrl(m.type === 'video' ? 'video/mp4' : 'image/jpeg');
+      onUrl(url);
+      return { ...m, url };
+    });
+    return { ...post, media, thumbnail: media[0]?.url ?? '' };
+  });
+};
+
+export interface RestoredArchive {
+  posts: Post[];
+  stories: Post[];
+  highlights: Post[];
+  profileMetadata: CacheData['profileMetadata'];
+}
+
+/**
+ * Turn a cache entry back into displayable state.
+ *
+ * `onUrl` receives every blob: URL minted so the caller can revoke them later.
+ * Returns null if a local archive's folder can no longer be reached.
+ */
+export const restoreArchive = async (
+  data: CacheData,
+  onUrl: (url: string) => void,
+): Promise<RestoredArchive | null> => {
+  if (!data.isLocal) {
+    return {
+      posts: rehydrateRemote(data.posts),
+      stories: rehydrateRemote(data.stories),
+      highlights: rehydrateRemote(data.highlights ?? []),
+      profileMetadata: data.profileMetadata,
+    };
+  }
+
+  const handle = await getDirectoryHandle(data.name);
+  if (!handle) return null;
+
+  const posts = await rehydrateLocal(data.posts, handle, onUrl);
+  if (!posts) return null;
+  const stories = (await rehydrateLocal(data.stories, handle, onUrl)) ?? [];
+  const highlights = (await rehydrateLocal(data.highlights ?? [], handle, onUrl)) ?? [];
+
+  return { posts, stories, highlights, profileMetadata: data.profileMetadata };
+};
diff --git a/src/lib/archive-files.ts b/src/lib/archive-files.ts
index 1da78b3..699236e 100644
--- a/src/lib/archive-files.ts
+++ b/src/lib/archive-files.ts
@@ -1,21 +1,51 @@
-import { ArchiveFile } from '../types';
+import { ArchiveFile, ArchiveSource } from '../types';
 
 export class LocalArchiveFile implements ArchiveFile {
-  constructor(private file: File) {}
+  /** Blob URLs minted here are revocable and must be released when done. */
+  readonly revocable = true;
+
+  /**
+   * @param explicitPath Set when the file came from the File System Access API,
+   *   whose File objects carry an empty webkitRelativePath.
+   */
+  constructor(private file: File, private explicitPath?: string) {}
   get name() { return this.file.name; }
-  get webkitRelativePath() { return this.file.webkitRelativePath; }
+  get webkitRelativePath() { return this.explicitPath ?? this.file.webkitRelativePath; }
   get size() { return this.file.size; }
   text() { return this.file.text(); }
   arrayBuffer() { return this.file.arrayBuffer(); }
   stream() { return this.file.stream(); }
+
+  /**
+   * A blob: URL backed directly by the on-disk File.
+   *
+   * Deliberately does NOT go through arrayBuffer() — a File is already a Blob,
+   * so this hands the browser a disk-backed handle instead of pulling the whole
+   * file into memory. Doing otherwise means a 20GB archive tries to become 20GB
+   * of resident blobs.
+   *
+   * When the picker gave us no MIME type, slice() re-tags the blob with a hint.
+   * slice() is a zero-copy view, so this stays memory-free either way.
+   */
+  createObjectUrl(mimeHint?: string) {
+    const source = this.file.type || !mimeHint
+      ? this.file
+      : this.file.slice(0, this.file.size, mimeHint);
+    return URL.createObjectURL(source);
+  }
 }
 
 export class RemoteArchiveFile implements ArchiveFile {
+  /** Served over HTTP; there is no object URL to release. */
+  readonly revocable = false;
+
   constructor(
     public name: string,
     public webkitRelativePath: string,
     public size: number,
-    public url: string
+    public url: string,
+    public source?: ArchiveSource,
+    public mtime?: number
   ) {}
   async text() {
     const res = await fetch(this.url);
@@ -33,4 +63,8 @@ export class RemoteArchiveFile implements ArchiveFile {
     });
     return transform.readable;
   }
+
+  createObjectUrl() {
+    return this.url;
+  }
 }
diff --git a/src/lib/archive-grouping.test.ts b/src/lib/archive-grouping.test.ts
new file mode 100644
index 0000000..1f814b9
--- /dev/null
+++ b/src/lib/archive-grouping.test.ts
@@ -0,0 +1,89 @@
+import { describe, expect, it } from 'vitest';
+import { classifyDirectory, groupArchiveDirectories } from './archive-grouping';
+
+describe('classifyDirectory', () => {
+  it('treats a bare profile directory as the base', () => {
+    expect(classifyDirectory('0ct0ber19')).toEqual({
+      owner: '0ct0ber19',
+      source: { kind: 'posts', dir: '0ct0ber19' },
+    });
+  });
+
+  it('recognises a reels sidecar', () => {
+    expect(classifyDirectory('0ct0ber19 - reels')).toEqual({
+      owner: '0ct0ber19',
+      source: { kind: 'reels', dir: '0ct0ber19 - reels' },
+    });
+  });
+
+  it('recognises a stories sidecar', () => {
+    expect(classifyDirectory('story - cher_ryppo')).toEqual({
+      owner: 'cher_ryppo',
+      source: { kind: 'stories', dir: 'story - cher_ryppo' },
+    });
+  });
+
+  it('splits highlight owner from title', () => {
+    const { owner, source } = classifyDirectory('story highlights - 0ct0ber19 - Heestory');
+    expect(owner).toBe('0ct0ber19');
+    expect(source.kind).toBe('highlight');
+    expect(source.title).toBe('Heestory');
+  });
+
+  it.each([
+    ['story highlights - theoldtaylorswiftinsta - 💙2014-1989 era', 'theoldtaylorswiftinsta', '💙2014-1989 era'],
+    ['story highlights - heejin_theworld - [Dall]', 'heejin_theworld', '[Dall]'],
+    ['story highlights - official_artms - Cosmo Schedule', 'official_artms', 'Cosmo Schedule'],
+    ['story highlights - 0ct0ber19 - Drawheeing⠀', '0ct0ber19', 'Drawheeing⠀'],
+    ['story highlights - official_artms - G.C.I', 'official_artms', 'G.C.I'],
+  ])('handles real-world title %s', (dir, owner, title) => {
+    const result = classifyDirectory(dir);
+    expect(result.owner).toBe(owner);
+    expect(result.source.title).toBe(title);
+  });
+
+  it('keeps titles containing " - " intact', () => {
+    // The username is matched as a non-space run, so only the first separator
+    // splits owner from title.
+    const { owner, source } = classifyDirectory('story highlights - user - a - b');
+    expect(owner).toBe('user');
+    expect(source.title).toBe('a - b');
+  });
+
+  it('does not mistake a profile with spaces for a sidecar', () => {
+    expect(classifyDirectory('Heejin_Bubble heejinmedia').source.kind).toBe('posts');
+  });
+});
+
+describe('groupArchiveDirectories', () => {
+  const dirs = [
+    '0ct0ber19',
+    '0ct0ber19 - reels',
+    'story - 0ct0ber19',
+    'story highlights - 0ct0ber19 - Heestory',
+    'story highlights - 0ct0ber19 - Drawheeing⠀',
+    'carlyraejepsen',
+  ];
+
+  it('folds sidecars into their base profile', () => {
+    const groups = groupArchiveDirectories(dirs);
+    expect([...groups.keys()].sort()).toEqual(['0ct0ber19', 'carlyraejepsen']);
+    expect(groups.get('0ct0ber19')).toHaveLength(5);
+    expect(groups.get('carlyraejepsen')).toHaveLength(1);
+  });
+
+  it('orders sources posts, reels, stories, then highlights by title', () => {
+    const sources = groupArchiveDirectories(dirs).get('0ct0ber19')!;
+    expect(sources.map(s => s.kind)).toEqual(['posts', 'reels', 'stories', 'highlight', 'highlight']);
+    expect(sources.slice(3).map(s => s.title)).toEqual(['Drawheeing⠀', 'Heestory']);
+  });
+
+  it('still groups a sidecar whose base profile is missing', () => {
+    const groups = groupArchiveDirectories(['story - orphan']);
+    expect(groups.get('orphan')).toEqual([{ kind: 'stories', dir: 'story - orphan' }]);
+  });
+
+  it('is stable for an empty archive root', () => {
+    expect(groupArchiveDirectories([]).size).toBe(0);
+  });
+});
diff --git a/src/lib/archive-grouping.ts b/src/lib/archive-grouping.ts
new file mode 100644
index 0000000..caca3a0
--- /dev/null
+++ b/src/lib/archive-grouping.ts
@@ -0,0 +1,71 @@
+/**
+ * Archive directory naming rules.
+ *
+ * Shared by the server (to fold sidecar directories into one profile) and the
+ * test suite. Kept free of Node built-ins so it can be imported from either.
+ */
+
+export type SourceKind = 'posts' | 'reels' | 'stories' | 'highlight';
+
+export interface ArchiveSource {
+  kind: SourceKind;
+  /** Directory name relative to the archives root. */
+  dir: string;
+  /** Highlight title, for kind === 'highlight'. */
+  title?: string;
+}
+
+/**
+ * Sidecar directories sit next to the profile directory they belong to:
+ *
+ *   0ct0ber19                                 -> posts     (base)
+ *   0ct0ber19 - reels                         -> reels
+ *   story - 0ct0ber19                         -> stories
+ *   story highlights - 0ct0ber19 - Heestory   -> highlight "Heestory"
+ *
+ * Instagram usernames cannot contain spaces, so matching the username as a
+ * run of non-space characters reliably separates it from a highlight title
+ * (titles may themselves contain spaces, dashes and emoji).
+ */
+export const classifyDirectory = (dirName: string): { owner: string; source: ArchiveSource } => {
+  const highlight = /^story highlights - ([^ ]+) - (.+)$/.exec(dirName);
+  if (highlight) {
+    return { owner: highlight[1], source: { kind: 'highlight', dir: dirName, title: highlight[2] } };
+  }
+
+  const stories = /^story - ([^ ]+)$/.exec(dirName);
+  if (stories) {
+    return { owner: stories[1], source: { kind: 'stories', dir: dirName } };
+  }
+
+  const reels = /^([^ ]+) - reels$/.exec(dirName);
+  if (reels) {
+    return { owner: reels[1], source: { kind: 'reels', dir: dirName } };
+  }
+
+  return { owner: dirName, source: { kind: 'posts', dir: dirName } };
+};
+
+const RANK: Record<SourceKind, number> = { posts: 0, reels: 1, stories: 2, highlight: 3 };
+
+/**
+ * Group the archive root's directories by profile.
+ *
+ * A sidecar whose owner has no base directory still forms a group of its own,
+ * so nothing becomes invisible just because the base profile is missing.
+ */
+export const groupArchiveDirectories = (dirNames: string[]): Map<string, ArchiveSource[]> => {
+  const groups = new Map<string, ArchiveSource[]>();
+
+  for (const dirName of dirNames) {
+    const { owner, source } = classifyDirectory(dirName);
+    if (!groups.has(owner)) groups.set(owner, []);
+    groups.get(owner)!.push(source);
+  }
+
+  for (const sources of groups.values()) {
+    sources.sort((a, b) => RANK[a.kind] - RANK[b.kind] || (a.title ?? '').localeCompare(b.title ?? ''));
+  }
+
+  return groups;
+};
diff --git a/src/lib/archive-index.ts b/src/lib/archive-index.ts
new file mode 100644
index 0000000..a7bf6e8
--- /dev/null
+++ b/src/lib/archive-index.ts
@@ -0,0 +1,232 @@
+import fs from 'fs';
+import fsp from 'fs/promises';
+import path from 'path';
+import { ArchiveSource, SourceKind, groupArchiveDirectories } from './archive-grouping.js';
+
+/**
+ * On-disk archive index.
+ *
+ * Archives live on network storage where per-file `stat` costs ~1.4ms and does
+ * not parallelise well, so walking every file on each request is unaffordable:
+ * measured against a real 110k-file archive root, listing took ~52s.
+ *
+ * Directory `stat` is effectively free, so each source directory is indexed
+ * once and re-used until its mtime changes. The index is warmed in the
+ * background at startup and persisted, making steady-state requests instant.
+ */
+
+export interface IndexedFile {
+  path: string;
+  size: number;
+  mtime: number;
+  kind: SourceKind;
+  title?: string;
+}
+
+interface DirIndex {
+  dir: string;
+  /** Directory mtime the index was built from; the cache key. */
+  mtimeMs: number;
+  files: IndexedFile[];
+}
+
+const MEDIA_RE = /\.(jpg|jpeg|png|webp|gif|bmp|tiff|mp4|webm|ogv|mov)$/i;
+const STAT_CONCURRENCY = 16;
+
+export class ArchiveIndex {
+  private dirs = new Map<string, DirIndex>();
+  private inFlight = new Map<string, Promise<DirIndex>>();
+  private dirty = false;
+
+  constructor(private archivesDir: string, private cachePath: string) {}
+
+  /** Visible (non-system) directories at the archive root. */
+  private listRootDirs(): string[] {
+    return fs.readdirSync(this.archivesDir, { withFileTypes: true })
+      .filter(e => e.isDirectory() && !/^[.@_]/.test(e.name))
+      .map(e => e.name);
+  }
+
+  groups(): Map<string, ArchiveSource[]> {
+    return groupArchiveDirectories(this.listRootDirs());
+  }
+
+  private dirMtime(dir: string): number {
+    try {
+      return fs.statSync(path.join(this.archivesDir, dir)).mtimeMs;
+    } catch {
+      return 0;
+    }
+  }
+
+  /** Recursively list relative file paths without stat()ing them. */
+  private walk(absDir: string, base = ''): string[] {
+    let out: string[] = [];
+    let entries: fs.Dirent[];
+    try {
+      entries = fs.readdirSync(absDir, { withFileTypes: true });
+    } catch {
+      return out;
+    }
+    for (const entry of entries) {
+      const rel = base ? `${base}/${entry.name}` : entry.name;
+      if (entry.isDirectory()) out = out.concat(this.walk(path.join(absDir, entry.name), rel));
+      else if (entry.isFile()) out.push(rel);
+    }
+    return out;
+  }
+
+  private async buildDir(source: ArchiveSource): Promise<DirIndex> {
+    const started = Date.now();
+    const mtimeMs = this.dirMtime(source.dir);
+    const absDir = path.join(this.archivesDir, source.dir);
+    const relPaths = this.walk(absDir);
+
+    // Only media needs a size (the client thumbnails anything over 1MiB), and
+    // only highlights need an mtime (their filenames carry no date). Skipping
+    // the rest avoids thousands of pointless round trips.
+    const needsStat = (rel: string) => MEDIA_RE.test(rel) || source.kind === 'highlight';
+
+    const files: IndexedFile[] = relPaths.map(rel => ({
+      path: `${source.dir}/${rel}`,
+      size: 0,
+      mtime: 0,
+      kind: source.kind,
+      ...(source.title ? { title: source.title } : {}),
+    }));
+
+    const targets = files.filter((_, i) => needsStat(relPaths[i]));
+    let cursor = 0;
+    const worker = async () => {
+      while (cursor < targets.length) {
+        const file = targets[cursor++];
+        try {
+          const stat = await fsp.stat(path.join(this.archivesDir, file.path));
+          file.size = stat.size;
+          file.mtime = stat.mtimeMs;
+        } catch { /* raced with a delete */ }
+      }
+    };
+    await Promise.all(Array.from({ length: STAT_CONCURRENCY }, worker));
+
+    console.log(
+      `[Index] ${source.dir}: ${files.length} files (${targets.length} statted) in ${((Date.now() - started) / 1000).toFixed(1)}s`
+    );
+    this.dirty = true;
+    return { dir: source.dir, mtimeMs, files };
+  }
+
+  /** Index for one source directory, rebuilding only if its mtime moved. */
+  private async ensureDir(source: ArchiveSource): Promise<DirIndex> {
+    const cached = this.dirs.get(source.dir);
+    const mtimeMs = this.dirMtime(source.dir);
+    if (cached && cached.mtimeMs === mtimeMs) return cached;
+
+    // Collapse concurrent requests for the same directory into one walk.
+    const existing = this.inFlight.get(source.dir);
+    if (existing) return existing;
+
+    const build = this.buildDir(source).then(index => {
+      this.dirs.set(source.dir, index);
+      this.inFlight.delete(source.dir);
+      return index;
+    }).catch(err => {
+      this.inFlight.delete(source.dir);
+      throw err;
+    });
+    this.inFlight.set(source.dir, build);
+    return build;
+  }
+
+  /** All files for one profile, across its base and sidecar directories. */
+  async filesFor(owner: string): Promise<IndexedFile[] | null> {
+    const sources = this.groups().get(owner);
+    if (!sources?.length) return null;
+    const indexes = await Promise.all(sources.map(s => this.ensureDir(s)));
+    return indexes.flatMap(i => i.files);
+  }
+
+  /**
+   * A cheap change signature for a profile, used by the client to decide
+   * whether its cached copy is stale. Built from directory mtimes only, so it
+   * costs one stat per source directory rather than a full walk.
+   */
+  signatureFor(sources: ArchiveSource[]): string {
+    return sources.map(s => `${s.dir}:${this.dirMtime(s.dir)}`).join('|');
+  }
+
+  /** File count for a profile, if its directories are already indexed. */
+  countFor(sources: ArchiveSource[]): number | null {
+    let total = 0;
+    for (const source of sources) {
+      const cached = this.dirs.get(source.dir);
+      if (!cached) return null;
+      total += cached.files.length;
+    }
+    return total;
+  }
+
+  /**
+   * Best-effort profile picture.
+   *
+   * Probes the conventional filenames first (one stat each) and only falls back
+   * to the indexed listing, so an unindexed archive still gets a thumbnail
+   * without triggering a walk.
+   */
+  thumbnailFor(owner: string, sources: ArchiveSource[]): string {
+    const base = sources.find(s => s.kind === 'posts') ?? sources[0];
+    if (!base) return '';
+
+    for (const candidate of [`${owner}.jpg`, `${owner}_profile_pic.jpg`, `${owner}.jpeg`, `${owner}.png`]) {
+      if (fs.existsSync(path.join(this.archivesDir, base.dir, candidate))) {
+        return `/archives/${encodeURI(`${base.dir}/${candidate}`)}`;
+      }
+    }
+
+    const cached = this.dirs.get(base.dir);
+    if (cached) {
+      const pick = cached.files.find(f => /_profile_pic\.jpg$/i.test(f.path))
+        ?? cached.files.find(f => /\.(jpg|jpeg|png|webp)$/i.test(f.path));
+      if (pick) return `/archives/${encodeURI(pick.path)}`;
+    }
+    return '';
+  }
+
+  /** Walk every directory once, in the background, so first opens are fast. */
+  async warm(): Promise<void> {
+    const started = Date.now();
+    const sources = [...this.groups().values()].flat();
+    console.log(`[Index] Warming ${sources.length} source directories...`);
+    for (const source of sources) {
+      try {
+        await this.ensureDir(source);
+      } catch (err) {
+        console.error(`[Index] Failed to index ${source.dir}:`, err);
+      }
+    }
+    await this.save();
+    console.log(`[Index] Warm complete in ${((Date.now() - started) / 1000).toFixed(1)}s`);
+  }
+
+  async load(): Promise<void> {
+    try {
+      const raw = await fsp.readFile(this.cachePath, 'utf8');
+      const parsed: DirIndex[] = JSON.parse(raw);
+      for (const entry of parsed) this.dirs.set(entry.dir, entry);
+      console.log(`[Index] Loaded ${this.dirs.size} directories from ${this.cachePath}`);
+    } catch {
+      console.log('[Index] No usable index cache; will build from scratch.');
+    }
+  }
+
+  async save(): Promise<void> {
+    if (!this.dirty) return;
+    try {
+      await fsp.writeFile(this.cachePath, JSON.stringify([...this.dirs.values()]), 'utf8');
+      this.dirty = false;
+      console.log(`[Index] Persisted ${this.dirs.size} directories to ${this.cachePath}`);
+    } catch (err) {
+      console.warn('[Index] Could not persist index (continuing in memory):', err);
+    }
+  }
+}
diff --git a/src/lib/archive-patterns.test.ts b/src/lib/archive-patterns.test.ts
new file mode 100644
index 0000000..6d4e32e
--- /dev/null
+++ b/src/lib/archive-patterns.test.ts
@@ -0,0 +1,118 @@
+import { describe, expect, it } from 'vitest';
+import { parseArchiveFilename, scopedPostId } from './archive-patterns';
+
+describe('parseArchiveFilename — Instagram export format', () => {
+  it('parses a single-image post', () => {
+    expect(parseArchiveFilename('2023-04-19_0ct0ber19 - CrORBIcJJbM.mp4')).toEqual({
+      postId: 'CrORBIcJJbM',
+      date: '2023-04-19',
+      username: '0ct0ber19',
+      index: 1,
+      ext: 'mp4',
+      isStory: false,
+    });
+  });
+
+  it('parses a carousel slide index', () => {
+    const parsed = parseArchiveFilename('2023-04-12_0ct0ber19 - Cq8LrxSJAJE - 3.jpg');
+    expect(parsed).toMatchObject({ postId: 'Cq8LrxSJAJE', index: 3, ext: 'jpg' });
+  });
+
+  it('groups a carousel under one post id', () => {
+    const ids = ['1', '2', '3'].map(
+      n => parseArchiveFilename(`2023-04-12_user - Cq8LrxSJAJE - ${n}.jpg`)!.postId,
+    );
+    expect(new Set(ids).size).toBe(1);
+  });
+
+  it('parses caption sidecar files', () => {
+    expect(parseArchiveFilename('2023-04-12_0ct0ber19 - Cq8LrxSJAJE.txt')).toMatchObject({
+      postId: 'Cq8LrxSJAJE',
+      ext: 'txt',
+    });
+  });
+
+  it('flags an explicit story suffix', () => {
+    expect(parseArchiveFilename('2023-04-12_user - ABC - story.jpg')?.isStory).toBe(true);
+  });
+
+  it('parses the story sidecar layout (date_user - N - shortcode)', () => {
+    // Files in `story - <user>` carry a per-day ordinal before the shortcode.
+    const parsed = parseArchiveFilename('2025-10-26_0ct0ber19 - 2 - DQRuDx9iW5Q.jpg', 'stories');
+    expect(parsed).toMatchObject({ date: '2025-10-26', username: '0ct0ber19', ext: 'jpg' });
+    expect(parsed!.postId).toContain('DQRuDx9iW5Q');
+  });
+
+  it('gives each story item a distinct id', () => {
+    const a = parseArchiveFilename('2026-08-13_u - 1 - Db-UTJcCUUr.mp4', 'stories')!.postId;
+    const b = parseArchiveFilename('2026-08-13_u - 2 - Db-oNJ1CWQ4.mp4', 'stories')!.postId;
+    expect(a).not.toBe(b);
+  });
+});
+
+describe('parseArchiveFilename — Instaloader format', () => {
+  it('parses a timestamped filename', () => {
+    expect(parseArchiveFilename('2024-01-01_12-00-00_UTC.jpg')).toMatchObject({
+      postId: '2024-01-01_12-00-00_UTC',
+      date: '2024-01-01',
+      index: 1,
+    });
+  });
+
+  it('parses the carousel suffix', () => {
+    expect(parseArchiveFilename('2024-01-01_12-00-00_UTC_2.jpg')?.index).toBe(2);
+  });
+
+  it('flags the story suffix', () => {
+    expect(parseArchiveFilename('2024-01-01_12-00-00_UTC_story.jpg')?.isStory).toBe(true);
+  });
+});
+
+describe('parseArchiveFilename — story highlights', () => {
+  it('parses the dateless highlight layout', () => {
+    expect(parseArchiveFilename('0ct0ber19 - C5dQPEYpd9W.mp4', 'highlight')).toMatchObject({
+      postId: 'C5dQPEYpd9W',
+      username: '0ct0ber19',
+      ext: 'mp4',
+      isStory: false,
+    });
+  });
+
+  it('dates a highlight from mtime when the filename has none', () => {
+    const mtime = Date.UTC(2024, 4, 17, 12, 0, 0);
+    expect(parseArchiveFilename('user - ABC.jpg', 'highlight', mtime)?.date).toBe('2024-05-17');
+  });
+
+  it('leaves the date empty when no mtime is available', () => {
+    expect(parseArchiveFilename('user - ABC.jpg', 'highlight')?.date).toBe('');
+  });
+
+  it('does not apply the loose highlight pattern outside highlight directories', () => {
+    // Would otherwise swallow ordinary "a - b.jpg" filenames.
+    expect(parseArchiveFilename('user - ABC.jpg', 'posts')).toBeNull();
+  });
+});
+
+describe('parseArchiveFilename — non-matching files', () => {
+  it.each(['0ct0ber19.jpg', 'profile_pic.jpg', 'README.md', 'no-separator.png'])(
+    'returns null for %s',
+    name => expect(parseArchiveFilename(name)).toBeNull(),
+  );
+});
+
+describe('scopedPostId', () => {
+  it('leaves base-profile ids untouched so permalinks keep working', () => {
+    expect(scopedPostId('Cq8LrxSJAJE', 'posts')).toBe('Cq8LrxSJAJE');
+  });
+
+  it('namespaces sidecar ids by directory', () => {
+    expect(scopedPostId('C5dQ', 'highlight', 'story highlights - u - Heestory'))
+      .toBe('story highlights - u - Heestory/C5dQ');
+  });
+
+  it('keeps the same shortcode distinct across sources', () => {
+    const inPosts = scopedPostId('ABC', 'posts');
+    const inHighlight = scopedPostId('ABC', 'highlight', 'story highlights - u - H');
+    expect(inPosts).not.toBe(inHighlight);
+  });
+});
diff --git a/src/lib/archive-patterns.ts b/src/lib/archive-patterns.ts
new file mode 100644
index 0000000..0f65c8c
--- /dev/null
+++ b/src/lib/archive-patterns.ts
@@ -0,0 +1,99 @@
+import { SourceKind } from '../types';
+
+/**
+ * Filename parsing rules for the archive formats the viewer understands.
+ *
+ * Kept as pure functions so the riskiest part of the scanner — deriving post
+ * identity, date and carousel order from a filename — can be tested directly.
+ */
+
+/** Instagram export: `2023-04-12_user - Cq8LrxSJAJE - 2.jpg` */
+export const EXPORT_RE = /^(\d{4}-\d{2}-\d{2})_(.+?) - (.+?)(?: - (\d+))?(?: - (story))?\.(.+)$/;
+
+/** Instaloader: `2024-01-01_12-00-00_UTC_2.jpg` */
+export const INSTALOADER_RE = /^(\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2}_UTC)(?:_(\d+))?(?:_(story))?\.(.+)$/;
+
+/**
+ * Story highlight: `user - C5dQPEYpd9W.mp4` — no date prefix.
+ *
+ * Loose enough to match ordinary filenames, so it is only applied to files the
+ * server has already tagged as coming from a highlight directory.
+ */
+export const HIGHLIGHT_RE = /^(.+?) - ([A-Za-z0-9_-]+)\.(\w+)$/;
+
+export interface ParsedFilename {
+  postId: string;
+  /** ISO date (YYYY-MM-DD), or '' when the filename carries none. */
+  date: string;
+  username: string;
+  /** 1-based carousel position. */
+  index: number;
+  ext: string;
+  isStory: boolean;
+}
+
+/**
+ * Parse an archive filename into post identity.
+ *
+ * `kind` selects which patterns apply; `mtime` supplies a date for formats that
+ * have none (highlights), so those items still sort and render sensibly.
+ * Returns null when no pattern matches — e.g. a profile picture.
+ */
+export const parseArchiveFilename = (
+  fileName: string,
+  kind: SourceKind = 'posts',
+  mtime?: number,
+): ParsedFilename | null => {
+  const exp = EXPORT_RE.exec(fileName);
+  if (exp) {
+    const [, date, username, postId, indexStr, story, ext] = exp;
+    return {
+      postId,
+      date,
+      username,
+      index: indexStr ? parseInt(indexStr, 10) : 1,
+      ext,
+      isStory: Boolean(story),
+    };
+  }
+
+  const ins = INSTALOADER_RE.exec(fileName);
+  if (ins) {
+    const [, postId, indexStr, story, ext] = ins;
+    return {
+      postId,
+      date: postId.split('_')[0],
+      username: '',
+      index: indexStr ? parseInt(indexStr, 10) : 1,
+      ext,
+      isStory: Boolean(story),
+    };
+  }
+
+  if (kind === 'highlight') {
+    const hl = HIGHLIGHT_RE.exec(fileName);
+    if (hl) {
+      const [, username, shortcode, ext] = hl;
+      return {
+        postId: shortcode,
+        date: mtime ? new Date(mtime).toISOString().split('T')[0] : '',
+        username,
+        index: 1,
+        ext,
+        isStory: false,
+      };
+    }
+  }
+
+  return null;
+};
+
+/**
+ * Namespace a post ID by its source directory.
+ *
+ * Base-profile IDs are left untouched so existing permalinks keep working;
+ * sidecar IDs are prefixed so a shortcode appearing in both the profile and a
+ * highlight stays two distinct posts.
+ */
+export const scopedPostId = (postId: string, kind: SourceKind, dir?: string): string =>
+  kind === 'posts' ? postId : `${dir ?? kind}/${postId}`;
diff --git a/src/lib/directory-handle.ts b/src/lib/directory-handle.ts
new file mode 100644
index 0000000..b375bf8
--- /dev/null
+++ b/src/lib/directory-handle.ts
@@ -0,0 +1,86 @@
+import { LocalArchiveFile } from './archive-files';
+
+/**
+ * File System Access API helpers.
+ *
+ * A `blob:` URL dies with the document, so a cached local archive whose media
+ * URLs are blob: URLs is worthless after a reload. A FileSystemDirectoryHandle,
+ * by contrast, is structured-cloneable and survives in IndexedDB — so we can
+ * re-open the same folder on a return visit and mint fresh URLs from it.
+ *
+ * Only Chromium implements showDirectoryPicker today; callers must handle the
+ * unsupported case by falling back to the <input webkitdirectory> flow.
+ */
+
+// Minimal typings — TS's lib.dom does not ship these in the configured version.
+type PermissionState = 'granted' | 'denied' | 'prompt';
+interface FileSystemHandlePermissionDescriptor { mode?: 'read' | 'readwrite' }
+export interface DirectoryHandle {
+  name: string;
+  kind: 'directory';
+  values(): AsyncIterableIterator<DirectoryHandle | FileHandle>;
+  queryPermission?(d?: FileSystemHandlePermissionDescriptor): Promise<PermissionState>;
+  requestPermission?(d?: FileSystemHandlePermissionDescriptor): Promise<PermissionState>;
+}
+interface FileHandle {
+  name: string;
+  kind: 'file';
+  getFile(): Promise<File>;
+}
+
+export const isDirectoryPickerSupported = () =>
+  typeof window !== 'undefined' && 'showDirectoryPicker' in window;
+
+export const pickDirectory = async (): Promise<DirectoryHandle | null> => {
+  if (!isDirectoryPickerSupported()) return null;
+  try {
+    return await (window as any).showDirectoryPicker({ mode: 'read' });
+  } catch (err) {
+    // AbortError simply means the user dismissed the picker.
+    return null;
+  }
+};
+
+/**
+ * Confirm we may still read this handle. Returns false when the user declines
+ * or the grant has lapsed, in which case the caller should re-prompt.
+ *
+ * `requestPermission` must be called from a user gesture, so only call this
+ * while handling a click.
+ */
+export const ensureReadPermission = async (handle: DirectoryHandle): Promise<boolean> => {
+  try {
+    if (!handle.queryPermission) return true;
+    if ((await handle.queryPermission({ mode: 'read' })) === 'granted') return true;
+    if (!handle.requestPermission) return false;
+    return (await handle.requestPermission({ mode: 'read' })) === 'granted';
+  } catch {
+    return false;
+  }
+};
+
+/**
+ * Recursively collect every file in the directory.
+ *
+ * Paths are prefixed with the root directory's name so they line up with the
+ * `webkitRelativePath` values produced by <input webkitdirectory>, keeping
+ * cached media paths valid regardless of which picker created them.
+ */
+export const filesFromDirectory = async (handle: DirectoryHandle): Promise<LocalArchiveFile[]> => {
+  const out: LocalArchiveFile[] = [];
+
+  const walk = async (dir: DirectoryHandle, prefix: string) => {
+    for await (const entry of dir.values()) {
+      const entryPath = `${prefix}/${entry.name}`;
+      if (entry.kind === 'directory') {
+        await walk(entry as DirectoryHandle, entryPath);
+      } else {
+        const file = await (entry as FileHandle).getFile();
+        out.push(new LocalArchiveFile(file, entryPath));
+      }
+    }
+  };
+
+  await walk(handle, handle.name);
+  return out;
+};
diff --git a/src/lib/utils.ts b/src/lib/utils.ts
index 2819a83..abec61d 100644
--- a/src/lib/utils.ts
+++ b/src/lib/utils.ts
@@ -1,6 +1,26 @@
 import { clsx, type ClassValue } from 'clsx';
 import { twMerge } from 'tailwind-merge';
+import { format, parseISO } from 'date-fns';
 
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs));
 }
+
+/**
+ * Format an archive date, tolerating junk.
+ *
+ * Dates are derived from filenames and arbitrary archive JSON, and date-fns
+ * `format` throws a RangeError on an invalid date — which would take down the
+ * whole modal for one malformed name. Story highlights in particular carry no
+ * date at all when file mtimes are unavailable.
+ */
+export function formatDateSafe(date: string | undefined, pattern: string): string {
+  if (!date) return '';
+  try {
+    const parsed = parseISO(date);
+    if (Number.isNaN(parsed.getTime())) return '';
+    return format(parsed, pattern);
+  } catch {
+    return '';
+  }
+}
diff --git a/src/main.tsx b/src/main.tsx
index d5b002c..b1e7fbf 100644
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -1,6 +1,7 @@
 import {StrictMode} from 'react';
 import {createRoot} from 'react-dom/client';
 import App from './App.tsx';
+import { ErrorBoundary } from './components/ErrorBoundary';
 import './index.css';
 import { registerSW } from 'virtual:pwa-register';
 
@@ -26,6 +27,8 @@ const updateSW = registerSW({
 
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
-    <App />
+    <ErrorBoundary>
+      <App />
+    </ErrorBoundary>
   </StrictMode>,
 );
diff --git a/src/types/index.ts b/src/types/index.ts
index 067292a..269accb 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -1,11 +1,32 @@
 export interface MediaFile {
   name: string;
+  /**
+   * Path relative to the archive root (matching webkitRelativePath for local
+   * folders). Unlike `url`, this survives a page reload, so it is what the
+   * cache persists and what URLs are rehydrated from.
+   */
+  path: string;
   url: string;
   type: 'image' | 'video';
   index: number;
   size?: number;
 }
 
+/**
+ * Which sidecar directory a post came from. Archives store reels, stories and
+ * each story highlight in directories alongside the base profile; the viewer
+ * folds them into one profile and routes them by kind.
+ */
+export type SourceKind = 'posts' | 'reels' | 'stories' | 'highlight';
+
+export interface ArchiveSource {
+  kind: SourceKind;
+  /** Directory name relative to the archives root. */
+  dir: string;
+  /** Highlight title, for kind === 'highlight'. */
+  title?: string;
+}
+
 export interface Post {
   id: string;
   date: string;
@@ -14,6 +35,10 @@ export interface Post {
   media: MediaFile[];
   thumbnail: string;
   isStory?: boolean;
+  /** Defaults to 'posts' for archives without sidecar directories. */
+  source?: SourceKind;
+  /** Highlight this post belongs to, for source === 'highlight'. */
+  highlightTitle?: string;
 }
 
 /**
@@ -27,11 +52,73 @@ export interface ArchiveFile {
   arrayBuffer(): Promise<ArrayBuffer>;
   stream(): ReadableStream<Uint8Array>;
   url?: string;
+  /**
+   * A URL pointing at this file's contents. Local files mint a disk-backed
+   * blob: URL (no data is read into memory); remote files return their HTTP URL.
+   */
+  createObjectUrl(mimeHint?: string): string;
+  /** True when createObjectUrl() returns a blob: URL that must be revoked. */
+  readonly revocable: boolean;
+  /** Which sidecar directory this file came from, when known. */
+  source?: ArchiveSource;
+  /** Last-modified time (ms). Used to date items whose filename has no date. */
+  mtime?: number;
 }
 
 export interface ServerArchive {
   name: string;
   thumbnail: string;
   path: string;
+  /** Null until the server has indexed this profile. */
+  fileCount: number | null;
+  /**
+   * Directory-mtime signature. Cheap for the server to compute and sufficient
+   * to detect changes, unlike a file count that would require a full walk.
+   */
+  signature?: string;
+  /** Base profile plus any sidecar directories folded into it. */
+  sources?: ArchiveSource[];
+}
+
+/** One entry from GET /api/archives/:name/files. */
+export interface ServerArchiveFile {
+  path: string;
+  size: number;
+  mtime: number;
+  kind: SourceKind;
+  title?: string;
+}
+
+export interface ProfileMetadata {
+  username: string;
+  fullName: string;
+  bio: string;
+  followerCount: number;
+  followingCount: number;
+  externalUrl: string;
+  profilePic: string | null;
+  allProfilePics: string[];
+}
+
+/** Shape of an archive entry persisted in IndexedDB. */
+export interface CacheData {
+  name: string;
+  isLocal: boolean;
   fileCount: number;
+  /** Server archives: the signature this entry was built from. */
+  signature?: string;
+  posts: Post[];
+  stories: Post[];
+  /** Story-highlight items, grouped by `highlightTitle`. */
+  highlights?: Post[];
+  profileMetadata: ProfileMetadata;
+  timestamp: number;
+  /**
+   * Local archives only: whether a FileSystemDirectoryHandle was stored
+   * alongside this entry, meaning media URLs can be rehydrated without
+   * re-prompting for the folder.
+   */
+  hasDirectoryHandle?: boolean;
+  /** Path of the profile picture, for rehydration (local archives). */
+  profilePicPath?: string;
 }
diff --git a/src/types/react-augment.d.ts b/src/types/react-augment.d.ts
new file mode 100644
index 0000000..6bdad23
--- /dev/null
+++ b/src/types/react-augment.d.ts
@@ -0,0 +1,12 @@
+import 'react';
+
+declare module 'react' {
+  interface InputHTMLAttributes<T> {
+    /**
+     * Non-standard attribute that makes a file input select a whole directory.
+     * Supported in Chromium and WebKit; used as the fallback picker where the
+     * File System Access API is unavailable.
+     */
+    webkitdirectory?: string;
+  }
+}
diff --git a/vite.config.ts b/vite.config.ts
index 60b7f04..3e2fcfa 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,11 +1,10 @@
 import tailwindcss from '@tailwindcss/vite';
 import react from '@vitejs/plugin-react';
 import path from 'path';
-import {defineConfig, loadEnv} from 'vite';
+import {defineConfig} from 'vite';
 import { VitePWA } from 'vite-plugin-pwa';
 
-export default defineConfig(({mode}) => {
-  const env = loadEnv(mode, '.', '');
+export default defineConfig(() => {
   return {
     plugins: [
       react(), 
@@ -21,13 +20,13 @@ export default defineConfig(({mode}) => {
           display: 'standalone',
           icons: [
             {
-              src: 'https://cdn-icons-png.flaticon.com/512/174/174855.png',
+              src: '/icon-512.png',
               sizes: '512x512',
               type: 'image/png',
               purpose: 'any maskable'
             },
             {
-              src: 'https://cdn-icons-png.flaticon.com/192/174/174855.png',
+              src: '/icon-192.png',
               sizes: '192x192',
               type: 'image/png'
             }
@@ -35,29 +34,12 @@ export default defineConfig(({mode}) => {
         },
         workbox: {
           navigateFallbackDenylist: [/^\/api/, /^\/archives/],
-          globPatterns: ['**/*.{js,css,html,ico,png,svg,woff,woff2}'],
-          runtimeCaching: [
-            {
-              urlPattern: /^https:\/\/fonts\.googleapis\.com\/.*/i,
-              handler: 'CacheFirst',
-              options: {
-                cacheName: 'google-fonts-cache',
-                expiration: {
-                  maxEntries: 10,
-                  maxAgeSeconds: 60 * 60 * 24 * 365
-                },
-                cacheableResponse: {
-                  statuses: [0, 200]
-                }
-              }
-            }
-          ]
+          // Fonts and icons are bundled locally, so everything the shell needs
+          // is precached and no runtime third-party caching rule is required.
+          globPatterns: ['**/*.{js,css,html,ico,png,svg,woff,woff2}']
         }
       })
     ],
-    define: {
-      'process.env.GEMINI_API_KEY': JSON.stringify(env.GEMINI_API_KEY),
-    },
     resolve: {
       alias: {
         '@': path.resolve(__dirname, '.'),