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/repositories.ts

@@ -9,6 +9,7 @@ import {
   npcSchema,
   questSchema,
   calendarSchema,
+  battleMapSchema,
   type Campaign,
   type CampaignDraft,
   type Character,
@@ -18,6 +19,7 @@ import {
   type Npc,
   type Quest,
   type Calendar,
+  type BattleMap,
 } from '@/lib/schemas';
 import { getSystem } from '@/lib/rules';
 
@@ -57,7 +59,7 @@ export const campaignsRepo = {
   async remove(id: string): Promise<void> {
     await db.transaction(
       'rw',
-      [db.campaigns, db.characters, db.encounters, db.diceRolls, db.notes, db.npcs, db.quests, db.calendars],
+      [db.campaigns, db.characters, db.encounters, db.diceRolls, db.notes, db.npcs, db.quests, db.calendars, db.maps],
       async () => {
         await db.characters.where('campaignId').equals(id).delete();
         await db.encounters.where('campaignId').equals(id).delete();
@@ -65,6 +67,7 @@ export const campaignsRepo = {
         await db.notes.where('campaignId').equals(id).delete();
         await db.npcs.where('campaignId').equals(id).delete();
         await db.quests.where('campaignId').equals(id).delete();
+        await db.maps.where('campaignId').equals(id).delete();
         await db.calendars.delete(id);
         await db.campaigns.delete(id);
       },
@@ -264,3 +267,25 @@ export const calendarRepo = {
     await db.calendars.put(calendarSchema.parse(calendar));
   },
 };
+
+// ---------------- Battle maps ----------------
+export const mapsRepo = {
+  listByCampaign(campaignId: string): Promise<BattleMap[]> {
+    return db.maps.where('campaignId').equals(campaignId).toArray();
+  },
+  async create(campaignId: string, name: string, image: string): Promise<BattleMap> {
+    const ts = now();
+    const map = battleMapSchema.parse({
+      id: newId(), campaignId, name, image, gridSize: 50, showGrid: true,
+      fogEnabled: false, revealed: [], tokens: [], createdAt: ts, updatedAt: ts,
+    });
+    await db.maps.add(map);
+    return map;
+  },
+  async save(map: BattleMap): Promise<void> {
+    await db.maps.put(battleMapSchema.parse({ ...map, updatedAt: now() }));
+  },
+  async remove(id: string): Promise<void> {
+    await db.maps.delete(id);
+  },
+};