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/utility-spells.ts

@@ -0,0 +1,53 @@
+// ─── Utility Mana Spells ────────────────────────────────────────────────────
+// Mental, Transference, Force
+import type { SpellDef } from '../../types';
+import { elemCost } from '../elements';
+
+export const UTILITY_SPELLS: Record<string, SpellDef> = {
+  // ─── TRANSFERENCE SPELLS ─────────────────────────────────────────────────────
+  // Transference magic moves mana and enhances efficiency
+  transferStrike: {
+    name: "Transfer Strike",
+    elem: "transference",
+    dmg: 9,
+    cost: elemCost("transference", 2),
+    tier: 1,
+    castSpeed: 3,
+    unlock: 150,
+    studyTime: 2,
+    desc: "Strike that transfers energy. Very efficient.",
+  },
+  manaRip: {
+    name: "Mana Rip",
+    elem: "transference",
+    dmg: 16,
+    cost: elemCost("transference", 3),
+    tier: 1,
+    castSpeed: 2.5,
+    unlock: 250,
+    studyTime: 4,
+    desc: "Rip mana from the enemy. High efficiency.",
+  },
+  essenceDrain: {
+    name: "Essence Drain",
+    elem: "transference",
+    dmg: 42,
+    cost: elemCost("transference", 7),
+    tier: 2,
+    castSpeed: 1.3,
+    unlock: 1050,
+    studyTime: 10,
+    desc: "Drain the enemy's essence.",
+  },
+  soulTransfer: {
+    name: "Soul Transfer",
+    elem: "transference",
+    dmg: 130,
+    cost: elemCost("transference", 16),
+    tier: 3,
+    castSpeed: 0.6,
+    unlock: 13000,
+    studyTime: 26,
+    desc: "Transfer the soul's energy.",
+  },
+};