fix: update StatsTab, DebugTab and all child components to use modular stores

- Updated StatsTab to use hooks directly (useSkillStore, usePrestigeStore, etc.)
- Updated DebugTab to use hooks directly
- Updated all debug child components (GameStateDebug, SkillDebug, AttunementDebug, etc.)
- Updated all stats child components (ManaStatsSection, CombatStatsSection, etc.)
- Fixed UpgradeEffectsSection.tsx syntax errors
- Updated page.tsx to not pass store prop to StatsTab and DebugTab
- All components now use modular stores directly instead of receiving store prop

src/lib/game/stores/index.ts

@@ -21,14 +21,13 @@ export { useGameStore } from './gameStore';
 export { useGameLoop } from './gameHooks';
 export type { GameCoordinatorState, GameCoordinatorStore } from './gameStore';
 
-// Re-export utilities from utils.ts
+// Re-export utilities from utils.ts and computed-stats
 export {
   fmt,
   fmtDec,
   getFloorMaxHP,
   getFloorElement,
   computeMaxMana,
-  computeElementMax,
   computeRegen,
   computeEffectiveRegen,
   computeClickMana,
@@ -41,3 +40,7 @@ export {
   canAffordSpellCost,
   deductSpellCost,
 } from '../utils';
+
+export { computeElementMax } from '../store-modules/computed-stats';
+
+export { getStudySpeedMultiplier, getStudyCostMultiplier } from '../constants';