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/lib/db/db.ts

@@ -3,7 +3,7 @@ import type { Campaign } from '@/lib/schemas/campaign';
 import type { Character } from '@/lib/schemas/character';
 import type { Encounter } from '@/lib/schemas/encounter';
 import type { DiceRoll } from '@/lib/schemas/dice';
-import type { Note, Npc, Quest, Calendar } from '@/lib/schemas/world';
+import type { Note, Npc, Quest, Calendar, BattleMap } from '@/lib/schemas/world';
 import { characterDefaults } from '@/lib/schemas/character';
 
 /**
@@ -23,6 +23,7 @@ export class TtrpgDatabase extends Dexie {
   npcs!: EntityTable<Npc, 'id'>;
   quests!: EntityTable<Quest, 'id'>;
   calendars!: EntityTable<Calendar, 'campaignId'>;
+  maps!: EntityTable<BattleMap, 'id'>;
 
   constructor() {
     super('ttrpg-manager');
@@ -62,6 +63,9 @@ export class TtrpgDatabase extends Dexie {
       quests: 'id, campaignId, status',
       calendars: 'campaignId',
     });
+
+    // v5 — Phase 7 maps/VTT.
+    this.version(5).stores({ maps: 'id, campaignId' });
   }
 }