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/lib/game/data/equipment/catalysts.ts

@@ -0,0 +1,31 @@
+// ─── Catalyst Equipment Types ───────────────────────────────────────────
+
+import type { EquipmentType } from './types';
+
+export const CATALYST_EQUIPMENT: Record<string, EquipmentType> = {
+  // ─── Main Hand - Catalysts ────────────────────────────────────────────────
+  basicCatalyst: {
+    id: 'basicCatalyst',
+    name: 'Basic Catalyst',
+    category: 'catalyst',
+    slot: 'mainHand',
+    baseCapacity: 40,
+    description: 'A simple catalyst for amplifying magical effects.',
+  },
+  fireCatalyst: {
+    id: 'fireCatalyst',
+    name: 'Fire Catalyst',
+    category: 'catalyst',
+    slot: 'mainHand',
+    baseCapacity: 55,
+    description: 'A catalyst attuned to fire magic. Enhances fire enchantments.',
+  },
+  voidCatalyst: {
+    id: 'voidCatalyst',
+    name: 'Void Catalyst',
+    category: 'catalyst',
+    slot: 'mainHand',
+    baseCapacity: 75,
+    description: 'A rare catalyst touched by void energy. High capacity but volatile.',
+  },
+};