Phase 7: maps & VTT

- BattleMap entity (image dataURL, grid, tokens, fog) — Dexie v5, repo, hook,
  cascade-deleted with campaign
- Maps page: upload image (8MB cap), per-campaign list
- Map editor canvas: grid overlay (toggle + cell size), fog of war (canvas) with
  reveal/hide painting + reveal-all/hide-all, draggable tokens that snap to the
  grid (pointer events, touch+mouse), add/remove tokens; debounced autosave
- Dashboard + routes get a Maps entry

New maps e2e (upload, add token, toggle fog).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/features/world/DashboardPage.tsx

@@ -18,6 +18,7 @@ const LINKS = [
   { to: '/notes', label: 'Notes & Wiki', icon: '📜' },
   { to: '/npcs', label: 'NPCs', icon: '🎭' },
   { to: '/quests', label: 'Quests', icon: '🗺' },
+  { to: '/maps', label: 'Maps', icon: '🗺️' },
   { to: '/calendar', label: 'Calendar', icon: '📅' },
   { to: '/compendium', label: 'Compendium', icon: '📚' },
   { to: '/dice', label: 'Dice', icon: '🎲' },