fix: repair persistence - safe-persist getItem now returns parsed objects, fix resetGame localStorage keys

- safe-persist.ts: getItem now calls JSON.parse(str) so Zustand receives {state, version} envelope
- gameActions.ts: fix 5 wrong localStorage keys in createResetGame (mana→mana-storage, etc.)
- Add persistence.test.ts with 12 tests covering round-trip, key verification, and reset
- All 918 tests pass with zero regressions

docs/project-structure.txt

@@ -219,6 +219,7 @@ Mana-Loop/
 │       │   │   ├── guardian-names.test.ts
 │       │   │   ├── mana-utils.test.ts
 │       │   │   ├── pact-utils.test.ts
+│       │   │   ├── persistence.test.ts
 │       │   │   ├── regression-fixes.test.ts
 │       │   │   ├── room-utils-floor-state.test.ts
 │       │   │   ├── room-utils.test.ts