Refactor large files into modular components

- Refactored page.tsx (613→252 lines) with GameOverScreen and LeftPanel extracted
- Refactored StatsTab.tsx (584→92 lines) with section components
- Refactored SkillsTab.tsx (434→54 lines) with sub-components
- Created modular structure for GameContext, LootInventory, and other components
- All extracted components organized into feature directories

src/components/game/tabs/PrestigeTab.tsx

@@ -3,7 +3,8 @@
 'use client';
 
 import { useState } from 'react';
-import { useGameStore, useGameLoop } from '@/lib/game/store';
+import { useGameStore } from '@/lib/game/store';
+import { useGameLoop } from '@/lib/game/stores/gameHooks';
 import { getUnifiedEffects } from '@/lib/game/effects';
 import {
   ELEMENTS,