- Fix syntax errors with missing brackets in store.ts and crafting-slice.ts
- Fix state mutation issues with lootInventory deep cloning
- Remove race condition from mid-tick set() call
- Fix COMBO_MASTER using wrong counter (totalTicks vs totalSpellsCast)
- Add null safety to hasSpecial() function
- Clamp mana to 0 in deductSpellCost() to prevent negative values
- Set up Vitest testing framework with 36 passing tests
