fix: resolve mana conversion, Spire/Grimoire tab errors, and legacy store references

- Fix mana conversion to deduct from regen instead of mana pool (resolves player stuck at 1 mana below cap)
- Fix Spire Tab error by removing unused legacy import (store-modules/enemy-utils)
- Fix Grimoire Tab error by adding Array.isArray check for effects.map
- Move utility functions from legacy store-modules to utils/ to eliminate legacy dependencies
- Add regression test for mana conversion fix
- Update SpellsTab.tsx imports to use utils instead of legacy stores

src/lib/game/stores/gameStore.ts

@@ -143,15 +143,26 @@ export const useGameStore = create<GameCoordinatorStore>()(
           meditateTicks = 0;
         }
 
-        // Calculate effective regen with incursion and meditation
-        const effectiveRegen = baseRegen * (1 - incursionStrength) * meditationMultiplier;
+        // Calculate total attunement conversion per tick (to subtract from regen)
+        const attunementState = useAttunementStore.getState();
+        let totalConversionPerTick = 0;
+        Object.entries(attunementState.attunements).forEach(([id, state]) => {
+          if (!state.active) return;
+          const def = ATTUNEMENTS_DEF[id];
+          if (!def || def.conversionRate <= 0 || !def.primaryManaType) return;
+          
+          const scaledRate = getAttunementConversionRate(id, state.level || 1);
+          totalConversionPerTick += scaledRate * HOURS_PER_TICK;
+        });
 
-        // Mana regeneration
+        // Calculate effective regen with incursion, meditation, and attunement conversion
+        const effectiveRegen = Math.max(0, baseRegen * (1 - incursionStrength) * meditationMultiplier - totalConversionPerTick);
+
+        // Mana regeneration (now includes attunement conversion deduction)
         let rawMana = Math.min(manaState.rawMana + effectiveRegen * HOURS_PER_TICK, maxMana);
         let elements = { ...manaState.elements };
 
-        // Apply attunement conversion (raw mana to primary mana types)
-        const attunementState = useAttunementStore.getState();
+        // Apply attunement conversion (add to primary mana types)
         Object.entries(attunementState.attunements).forEach(([id, state]) => {
           if (!state.active) return;
           const def = ATTUNEMENTS_DEF[id];
@@ -160,17 +171,11 @@ export const useGameStore = create<GameCoordinatorStore>()(
           const scaledRate = getAttunementConversionRate(id, state.level || 1);
           const conversionThisTick = scaledRate * HOURS_PER_TICK; // per tick
           
-          // Cap conversion to available raw mana
-          const actualConversion = Math.min(conversionThisTick, rawMana);
-          
-          // Subtract from raw mana
-          rawMana = Math.max(0, rawMana - actualConversion);
-          
-          // Add to primary mana type
+          // Add to primary mana type (cost already deducted from regen)
           if (elements[def.primaryManaType]) {
             elements[def.primaryManaType].current = Math.min(
               elements[def.primaryManaType].max,
-              elements[def.primaryManaType].current + actualConversion
+              elements[def.primaryManaType].current + conversionThisTick
             );
           }
         });