feat(scanner): rebuild as mobile-first three-phase flow
Replace the desktop-first, everything-at-once scanner layout with a
phased mobile-optimized experience: Setup → Scanning → Review.
Phase 1 (Setup): destination picker, game filter, deck mode toggle,
scan history (last 5 sessions).
Phase 2 (Scanning): full-screen camera with auto-start, haptic + sound
feedback on card detection, torch/flash toggle, count pill, bottom-sheet
disambiguation (replaces full-screen modal).
Phase 3 (Review): card list with inline condition/foil/qty edits,
batch confirm, 30-second undo, deck progress indicator.
New features:
- Deck mode (progress toward 40/60/99 card target)
- Scan history (persisted to localStorage)
- Sound feedback (Web Audio oscillator, configurable)
- Offline queue (localStorage persistence + auto-retry on reconnect)
- Camera flash/torch toggle
- Batch ownership API (replaces N+1 per-card fetches)
- Visibility pause (detection loop stops when tab is backgrounded)
Convoy: scanner-rebuild
Co-authored-by: Cursor <cursoragent@cursor.com>
cf9fea0726