fix: prevent conversion system from auto-unlocking all mana types on first tick

- Removed auto-unlock lines in gameStore.ts element regen loop and recovery room boost loop
- Added unlocked guard to skip locked elements during conversion processing
- Added regression test (bug-377) verifying only transference stays unlocked

Fixes #377

docs/project-structure.txt

@@ -203,6 +203,7 @@ Mana-Loop/
 │   │   │   │   ├── bug-352-golem-mana-wipe.test.ts
 │   │   │   │   ├── bug-353-preparation-mana.test.ts
 │   │   │   │   ├── bug-354-unlock-attunement.test.ts
+│   │   │   │   ├── bug-377-mana-auto-unlock.test.ts
 │   │   │   │   ├── bug-fixes.test.ts
 │   │   │   │   ├── combat-actions.test.ts
 │   │   │   │   ├── combat-utils.test.ts