feat(02-01): Zustand store + V1Payload extension + save lifecycle hooks

- Zustand 5 vanilla createStore composes 4 slices (garden / memory /
  narrative / session); useAppStore React hook re-renders on selector
  change; getState() works without React (Phaser ↔ React bridge per D-32)
- simAdapter exposes drainCommands / applyTilesAndUnlocks /
  applyHarvestedFragments / applyLuraProgress / applyTickCount; sim
  never imports the store (CORE-10)
- V1Payload extended in place per D-34: tickCount (BLOCKER 3 monotonic
  counter), unlockedPlantTypes, luraBeatProgress, offlineEvents,
  settings.persistenceToastShown — CURRENT_SCHEMA_VERSION stays 1, no
  migrations[2] sneaked in (regression-defense test pins this)
- migrations[1] populates all new field defaults; tickCount: 0 means
  fresh sims always start at sim-tick 0
- registerSaveLifecycleHooks (UX-10): visibilitychange→hidden,
  beforeunload, plus saveOnSeasonTransition() — Vitest covers all three
- Phaser EventBus singleton seeded per the Phaser 4 React-template pattern
- Install @testing-library/react as devDep so the React-hook test can
  exercise the real renderHook surface
- 27 new tests across store / migrations / lifecycle all green; full
  npm run ci is 126/126

package.json

@@ -31,6 +31,7 @@
   },
   "devDependencies": {
     "@playwright/test": "^1.59.1",
+    "@testing-library/react": "^16.3.2",
     "@types/node": "^22.19.18",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",