refactor(chat): replace manual in-memory feed with DB-reactive flow#956
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The chat feed is now driven by Room reactive queries instead of manual _state.update patches. ChatCoordinator combines metadata and member observeAll() flows to build the feed, so any DB write (from feed sync, event stream, push notification, or sendMessage) automatically updates the contact list previews. - Add observeAll() to ChatMemberDao/DataSource - Add exists() to ChatMetadataDataSource - Add observeFeedFromDb() replacing hydrateFromPersistence() - Store lastMessage during feed sync and FullRefresh updates - Remove manual feed patching from applyUpdate, sendMessage, advanceReadPointer - Update loadMessages to write metadata so previews refresh Signed-off-by: Brandon McAnsh <git@bmcreations.dev>
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The chat feed is now driven by Room reactive queries instead of manual _state.update patches. ChatCoordinator combines metadata and member observeAll() flows to build the feed, so any DB write (from feed sync, event stream, push notification, or sendMessage) automatically updates the contact list previews.