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1. State Synchronization (subscribed flag) - Removed manual 'subscribed' boolean from Channel struct - Now queries TimelineCache directly to check subscription state - Eliminates desync bugs between flag and actual timeline state - Locations: channels.rs, app.rs 2. Reaction State Persistence - Replaced temporary UI state (.insert_temp) with nostrdb queries - Created has_user_reacted() function to query Kind 7 reactions - Reactions now persist across app restarts - Heart icons correctly reflect reaction state from database - Location: chat_view.rs, app.rs 3. Message Virtualization for Performance - Implemented egui_virtual_list::VirtualList for ChatView - Only renders visible messages instead of all messages - Precomputes message grouping info to work with virtualization - Solves performance issues with 1000+ message channels - Expected performance: ~60 FPS even with large channels - Location: chat_view.rs All critical issues from architect and QA reviews are now fixed: ✓ State synchronization bug ✓ Reaction persistence bug ✓ Message rendering performance ✓ Error handling (from previous commit) ✓ Internationalization (from previous commit) ✓ Code refactoring (from previous commit) Build status: Compiles successfully with only minor warnings