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/golems/base-golems.ts

@@ -0,0 +1,30 @@
+// ─── Base Golem Definitions ───────────────────────────────────
+
+import type { GolemDef } from './types';
+import { elemCost } from './types';
+
+export const BASE_GOLEMS: Record<string, GolemDef> = {
+  // ─── BASE GOLEMS ─────────────────────────────────────────────────────
+  
+  // Earth Golem - Basic, available with Fabricator attunement
+  earthGolem: {
+    id: 'earthGolem',
+    name: 'Earth Golem',
+    description: 'A sturdy construct of stone and soil. Slow but powerful.',
+    baseManaType: 'earth',
+    summonCost: [elemCost('earth', 10)],
+    maintenanceCost: [elemCost('earth', 0.5)],
+    damage: 8,
+    attackSpeed: 1.5,
+    hp: 50,
+    armorPierce: 0.15,
+    isAoe: false,
+    aoeTargets: 1,
+    unlockCondition: {
+      type: 'attunement_level',
+      attunement: 'fabricator',
+      level: 2,
+    },
+    tier: 1,
+  },
+};