refactor: remove legacy store.ts and crafting-slice.ts, complete modular store migration

- Delete store.ts (355 LOC monolithic store, zero imports)
- Delete crafting-slice.ts (379 LOC legacy crafting module)
- Inline createStartingEquipment() into craftingStore.ts
- Remove legacy equipment/inventory fields from GameState
- Remove EquipmentDef from game.ts imports (unused)
- Fix duplicate EquipmentSpellState export in types.ts
- Fix bluePrintId typo in craftingStore.ts
- Update stores/index.ts to import CraftingState/CraftingActions from craftingStore.types
- Update EquipmentTab.test.ts to test store state instead of deleted module
- Clean up stale comments referencing crafting-slice.ts
- Reduce TS errors from 83 to 72 by removing conflicting legacy types

src/lib/game/utils/mana-utils.ts

@@ -29,9 +29,7 @@ export function computeMaxMana(
   return base;
 }
 
-// computeElementMax is now in ../store.ts with support for unlockedManaTypeUpgrades
-// This file no longer exports computeElementMax to avoid duplicate export issues
-// Import computeElementMax from '../store' instead
+// computeElementMax has been removed — element max is computed in manaStore.ts
 
 export function computeRegen(
   state: Pick<GameState, 'skills' | 'prestigeUpgrades' | 'skillUpgrades' | 'skillTiers' | 'attunements'>,