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

src/lib/game/utils/safe-persist.ts

@@ -1,6 +1,11 @@
 // ─── Safe Persist Storage ─────────────────────────────────────────────────────
 // Wraps localStorage with error handling for Zustand persist middleware.
 // Handles: quota exceeded, corrupted JSON, and unexpected read/write failures.
+//
+// Zustand persist storage contract:
+//   getItem(name)  → returns parsed object { state, version } | null
+//   setItem(name, value) → receives object { state, version }, must serialize
+//   removeItem(name) → removes the key
 
 import type { StateStorage } from 'zustand/middleware';
 
@@ -10,14 +15,16 @@ import type { StateStorage } from 'zustand/middleware';
  * - Quota exceeded → logs warning, skips write
  * - Other errors → logs warning, graceful fallback
  */
-export function createSafeStorage(): any {
+export function createSafeStorage(): StateStorage {
   const storage: StateStorage = {
     getItem: (name: string): string | null | Promise<string | null> => {
       try {
         const str = localStorage.getItem(name);
         if (str === null) return null;
-        return str;
+        // Zustand expects the parsed storage envelope { state, version }
+        return JSON.parse(str);
       } catch (error) {
+        // Corrupted JSON or other read error — clear the bad data
         try {
           localStorage.removeItem(name);
         } catch {
@@ -28,6 +35,7 @@ export function createSafeStorage(): any {
     },
     setItem: (name: string, value: unknown): void => {
       try {
+        // Zustand passes the storage envelope { state, version } as a JS object
         localStorage.setItem(name, JSON.stringify(value));
       } catch (error) {
         console.error('[safe-persist] Failed to persist:', name, error);
@@ -37,6 +45,7 @@ export function createSafeStorage(): any {
       try {
         localStorage.removeItem(name);
       } catch (error) {
+        // ignore
       }
     },
   };