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/enchantments/spell-effects/tier3-spells.ts

@@ -0,0 +1,37 @@
+// ─── Tier 3 Master Spells ─────────────────────────────────────
+
+import type { EnchantmentEffectDef } from './types';
+import { ALL_CASTER } from './types';
+
+export const TIER3_SPELL_EFFECTS: Record<string, EnchantmentEffectDef> = {
+  spell_pyroclasm: {
+    id: 'spell_pyroclasm',
+    name: 'Pyroclasm',
+    description: 'Grants the ability to cast Pyroclasm (250 fire damage)',
+    category: 'spell',
+    baseCapacityCost: 400,
+    maxStacks: 1,
+    allowedEquipmentCategories: ALL_CASTER,
+    effect: { type: 'spell', spellId: 'pyroclasm' }
+  },
+  spell_tsunami: {
+    id: 'spell_tsunami',
+    name: 'Tsunami',
+    description: 'Grants the ability to cast Tsunami (220 water damage)',
+    category: 'spell',
+    baseCapacityCost: 380,
+    maxStacks: 1,
+    allowedEquipmentCategories: ALL_CASTER,
+    effect: { type: 'spell', spellId: 'tsunami' }
+  },
+  spell_meteorStrike: {
+    id: 'spell_meteorStrike',
+    name: 'Meteor Strike',
+    description: 'Grants the ability to cast Meteor Strike (280 earth damage)',
+    category: 'spell',
+    baseCapacityCost: 420,
+    maxStacks: 1,
+    allowedEquipmentCategories: ALL_CASTER,
+    effect: { type: 'spell', spellId: 'meteorStrike' }
+  },
+};