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0e59ed7a13
Leverage Room 3.0.0-alpha04's FTS5 support to enable searching message history. Uses external content table backed by Packet entity. Schema changes (migration 38→39): - Add message_text column to Packet entity - Create PacketFts virtual table with FTS5 index on message_text - Content triggers auto-sync FTS index on INSERT/UPDATE/DELETE Search stack: - PacketDao: searchMessages/searchMessagesInConversation queries - DatabaseManager: backfillSearchIndexIfNeeded on DB switch - PacketRepository: searchMessages with FTS query sanitization - MessageViewModel: debounced search (300ms, min 2 chars) - MessageSearchBar: M3 TopAppBar replacement pattern Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>