Phase 5: campaign management & worldbuilding

- New entities (note/npc/quest/calendar): schemas, Dexie v4 tables, repos, hooks;
  campaign cascade-delete now covers them all
- Dashboard hub: campaign stats, navigation cards, party overview, recent rolls;
  opening a campaign lands here
- Notes/Wiki: tags, [[wiki-links]] with click-to-open/create, backlinks panel,
  full-text search, autosave
- NPC manager (role/location/faction/status) and Quest tracker (status +
  objectives checklist + reward)
- In-world Calendar: integer day counter + events (no real Date -> no timezone bug)
- Fix: calendarRepo.get is read-only (creating-on-read crashed inside liveQuery)

8 new unit tests (wikilinks + extended cascade), worldbuilding e2e.

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

src/app/RootLayout.tsx

@@ -9,6 +9,7 @@ import { Button } from '@/components/ui/Button';
 
 const NAV = [
   { to: '/', label: 'Campaigns', exact: true },
+  { to: '/dashboard', label: 'Dashboard', exact: false },
   { to: '/characters', label: 'Characters', exact: false },
   { to: '/combat', label: 'Combat', exact: false },
   { to: '/dice', label: 'Dice', exact: false },