feat: backup/restore, user profile popover, image compress, video blur, wake lock

- backup/restore dialog + user profile popover components
- image compression, video blur, wake lock utilities
- message cache + conversation messages hook refinements
- call context, active speakers, screen share dialog tweaks
- audio + screen share settings persistence
- refreshed app icons (smaller sizes) across all platforms

apps/desktop/src/lib/messageCache.ts

@@ -54,6 +54,44 @@ async function loadDb(): Promise<Database | null> {
     await db.execute(
       'CREATE INDEX IF NOT EXISTS idx_msgs_conv_created ON messages(conversation_id, created_at);',
     );
+    // FTS5 virtual table for instant full-text search across the cache.
+    // Keeps only the searchable text columns (plaintext + sender), keyed
+    // by the message id so we can join back to the main row. Triggers
+    // mirror inserts/updates/deletes so the index never drifts.
+    //
+    // Falls back gracefully on FTS5-less builds: the IF NOT EXISTS keeps
+    // the call idempotent, and the surrounding try/catch already handles
+    // a CREATE failure by skipping the whole cache.
+    try {
+      await db.execute(
+        `CREATE VIRTUAL TABLE IF NOT EXISTS messages_fts USING fts5(
+          message_id UNINDEXED,
+          conversation_id UNINDEXED,
+          plaintext,
+          tokenize = 'unicode61 remove_diacritics 2'
+        );`,
+      );
+      await db.execute(
+        `CREATE TRIGGER IF NOT EXISTS messages_ai AFTER INSERT ON messages BEGIN
+           INSERT INTO messages_fts (message_id, conversation_id, plaintext)
+           VALUES (new.id, new.conversation_id, COALESCE(new.plaintext, ''));
+         END;`,
+      );
+      await db.execute(
+        `CREATE TRIGGER IF NOT EXISTS messages_ad AFTER DELETE ON messages BEGIN
+           DELETE FROM messages_fts WHERE message_id = old.id;
+         END;`,
+      );
+      await db.execute(
+        `CREATE TRIGGER IF NOT EXISTS messages_au AFTER UPDATE ON messages BEGIN
+           DELETE FROM messages_fts WHERE message_id = old.id;
+           INSERT INTO messages_fts (message_id, conversation_id, plaintext)
+           VALUES (new.id, new.conversation_id, COALESCE(new.plaintext, ''));
+         END;`,
+      );
+    } catch (err: unknown) {
+      console.warn('FTS5 init failed — search falls back to in-memory scan', err);
+    }
     return db;
   } catch (err: unknown) {
     console.warn('messageCache init failed — falling back to memory-only', err);
@@ -157,6 +195,54 @@ export async function deleteCachedMessage(id: string): Promise<void> {
   }
 }
 
+// Full-text search across cached messages. Returns rows in newest-first
+// order; caller maps to DecryptedMessage. Empty result on cache-miss or
+// FTS5 not available — caller should fall back to in-memory regex.
+export async function searchCachedMessages(
+  conversationId: string,
+  query: string,
+  limit = 200,
+): Promise<DecryptedMessage[]> {
+  const db = await getDb();
+  if (!db) return [];
+  const trimmed = query.trim();
+  if (trimmed.length === 0) return [];
+  // Sanitize for FTS5 MATCH syntax. Strip quotes + control chars; wrap in
+  // an OR over each token with a trailing wildcard so partial words match.
+  // Hyphens + colons are FTS5 operators so we drop them.
+  const tokens = trimmed
+    .replace(/["'\u0000-\u001f]/g, ' ')
+    .replace(/[-:^]/g, ' ')
+    .split(/\s+/)
+    .filter(Boolean);
+  if (tokens.length === 0) return [];
+  const matchExpr = tokens.map((t) => '"' + t.replace(/"/g, '') + '"*').join(' AND ');
+  try {
+    const rows = await db.select<Row>(
+      `SELECT m.* FROM messages m
+       JOIN messages_fts f ON f.message_id = m.id
+       WHERE f.conversation_id = $1 AND messages_fts MATCH $2
+       ORDER BY m.created_at DESC
+       LIMIT $3`,
+      [conversationId, matchExpr, limit],
+    );
+    return rows.map((r) => ({
+      id: r.id,
+      conversationId: r.conversation_id,
+      senderId: r.sender_id,
+      senderDeviceId: r.sender_device_id,
+      replyToId: r.reply_to_id,
+      editedAt: r.edited_at,
+      deletedAt: r.deleted_at,
+      createdAt: r.created_at,
+      plaintext: r.plaintext,
+    }));
+  } catch (err: unknown) {
+    console.warn('searchCachedMessages failed', err);
+    return [];
+  }
+}
+
 // Housekeeping — run once per session to bound the cache size. Keeps the
 // latest KEEP_PER_CONV messages per conversation.
 const KEEP_PER_CONV = 1000;