Add a global last-action stack with toast-based "Undo" buttons and a
Cmd/Ctrl+Z hotkey for the destructive photo operations.
Reversible:
- X (discard) → bulkRestore
- U (restore) → bulkDiscard
- Drag-onto-Discarded → bulkRestore
- Drag-onto-folder (move) → move back to per-photo source folders. The
source folder ids are snapshotted from the photos cache before the
move runs, then grouped so multi-source moves restore correctly.
- Restore button in the discard action bar → bulkDiscard
Toast gains an optional action button (label + onClick); toasts with an
action stay visible longer so the user has time to click. The undo
store caps at 20 entries; failed undo re-pushes the entry so the user
can try again.
Not reversible (call out, document later): rating, color label, copy,
permanent delete from trash, tag changes.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
