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/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-05-27T13:22:19.613Z",
+    "generated": "2026-05-27T13:57:21.361Z",
     "description": "Import dependency graph for src/lib/game. Keys are files, values are arrays of files they import.",
     "usage": "To find what a file affects, search for its path in the VALUES. To find what a file depends on, look at its KEY entry."
   },