Changes:
- SyncProgress.kt: Add INFO phase to SyncPhase enum
- SyncProgress.kt: Update isVisible to always show INFO phase
- SyncStateManager.kt: Add showInfo() and showError() methods
- SyncProgressBanner.kt: Add INFO icon (Icons.Outlined.Info) + secondaryContainer color
- SyncProgressBanner.kt: Add INFO branch in phaseToString()
- ComposeMainActivity.kt: Add auto-hide for INFO phase (2.5s delay)
- MainViewModel.kt: Replace Toast with Banner in deleteNoteFromServer()
- MainViewModel.kt: Replace Toast with Banner in deleteMultipleNotesFromServer()
- NoteEditorViewModel.kt: Import SyncStateManager
- NoteEditorViewModel.kt: Add Banner feedback (INFO/ERROR) in editor deleteNote()
- NoteEditorViewModel.kt: Remove NOTE_SAVED toast (NavigateBack is sufficient)
- NoteEditorViewModel.kt: Remove NOTE_DELETED toast (already done)
All non-interactive notifications now use the unified Banner system.
Server-delete results show as INFO (success) or ERROR (failure) banners.
Snackbars with Undo actions and NOTE_IS_EMPTY validation toasts remain unchanged.
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