Persistence:
- SavedMessage SwiftData model with index on [buffer, timestamp]
- @Query in ChatBufferView/DMListView/DMConversationView — SwiftData is the single source of truth, no in-memory dictionary
- Settings: Save Messages toggle, Save Debug Buffer toggle, Delete After picker (1d/1w/1m/1y/never), Delete All with confirmation dialog
- Expired and debug messages purged on launch based on settings
- Say messages go to debug buffer only (not all buffers)
Reactive side effects:
- Sound, haptic, and VoiceOver announcement all fire from ChatBufferView's onChange(of: messages.count)
- Sound plays for active buffer or background buffers if enabled
- Haptic and announcement fire on active buffer only, current session only (I'll add a toggle to announce other buffers next)
- Status haptic for Say messages stays imperative in model (global event, not per-buffer)
- Removed trigger counters and lastAnnouncement from ConnectionManager
DM conversation fix:
- Track DM recipient via lastDMRecipientId; tag outgoing echoes with partner ID in characterId
- Conversation view filters on characterId == partnerId (shows only that conversation)
Other:
- modelContext set in ContentView.onAppear (available for all screens)
- Instant scroll (no animation), respects Reduce Motion
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