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/constants/spells-modules/aoe-spells.ts

@@ -0,0 +1,93 @@
+// ─── AOE Spells ──────────────────────────────────────────────────────────────
+// Hit multiple enemies, less damage per target
+import type { SpellDef } from '../../types';
+import { elemCost } from '../elements';
+
+export const AOE_SPELLS: Record<string, SpellDef> = {
+  // Tier 1 AOE
+  fireballAoe: {
+    name: "Fireball (AOE)",
+    elem: "fire",
+    dmg: 8,
+    cost: elemCost("fire", 3),
+    tier: 1,
+    castSpeed: 2,
+    unlock: 150,
+    studyTime: 3,
+    desc: "An explosive fireball that hits 3 enemies.",
+    isAoe: true,
+    aoeTargets: 3,
+    effects: [{ type: 'aoe', value: 3 }]
+  },
+  frostNova: {
+    name: "Frost Nova",
+    elem: "water",
+    dmg: 6,
+    cost: elemCost("water", 3),
+    tier: 1,
+    castSpeed: 2,
+    unlock: 140,
+    studyTime: 3,
+    desc: "A burst of frost hitting 4 enemies. May freeze.",
+    isAoe: true,
+    aoeTargets: 4,
+    effects: [{ type: 'freeze', value: 0.15, chance: 0.2 }]
+  },
+  
+  // Tier 2 AOE
+  meteorShower: {
+    name: "Meteor Shower",
+    elem: "fire",
+    dmg: 20,
+    cost: elemCost("fire", 8),
+    tier: 2,
+    castSpeed: 1,
+    unlock: 1200,
+    studyTime: 10,
+    desc: "Rain meteors on 5 enemies.",
+    isAoe: true,
+    aoeTargets: 5
+  },
+  blizzard: {
+    name: "Blizzard",
+    elem: "water",
+    dmg: 18,
+    cost: elemCost("water", 7),
+    tier: 2,
+    castSpeed: 1.2,
+    unlock: 1000,
+    studyTime: 9,
+    desc: "A freezing blizzard hitting 4 enemies.",
+    isAoe: true,
+    aoeTargets: 4,
+    effects: [{ type: 'freeze', value: 0.1, chance: 0.15 }]
+  },
+  earthquakeAoe: {
+    name: "Earth Tremor",
+    elem: "earth",
+    dmg: 25,
+    cost: elemCost("earth", 8),
+    tier: 2,
+    castSpeed: 0.8,
+    unlock: 1400,
+    studyTime: 10,
+    desc: "Shake the ground, hitting 3 enemies with high damage.",
+    isAoe: true,
+    aoeTargets: 3
+  },
+  
+  // Tier 3 AOE
+  apocalypse: {
+    name: "Apocalypse",
+    elem: "fire",
+    dmg: 80,
+    cost: elemCost("fire", 20),
+    tier: 3,
+    castSpeed: 0.5,
+    unlock: 15000,
+    studyTime: 30,
+    desc: "End times. Hits ALL enemies with devastating fire.",
+    isAoe: true,
+    aoeTargets: 10
+  },
+};