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/crafting-actions/crafting-equipment-actions.ts

@@ -0,0 +1,89 @@
+// ─── Equipment Crafting Actions ────────────────────────────────────────────
+
+import type { GameState } from '../types';
+import * as CraftingEquipment from '../crafting-equipment';
+
+export function startCraftingEquipment(
+  blueprintId: string,
+  get: () => GameState,
+  set: (fn: (state: GameState) => Partial<GameState>) => void
+): boolean {
+  const state = get();
+
+  const check = CraftingEquipment.canStartEquipmentCrafting(
+    blueprintId,
+    state.lootInventory.blueprints.includes(blueprintId),
+    state.lootInventory.materials,
+    state.rawMana,
+    state.currentAction
+  );
+
+  if (!check.canCraft) return false;
+
+  const result = CraftingEquipment.initializeEquipmentCrafting(
+    blueprintId,
+    state.lootInventory.materials,
+    state.rawMana
+  );
+
+  set((state) => ({
+    lootInventory: {
+      ...state.lootInventory,
+      materials: result.newMaterials,
+    },
+    rawMana: state.rawMana - result.manaCost,
+    currentAction: 'craft' as const,
+    equipmentCraftingProgress: result.progress,
+  }));
+
+  return true;
+}
+
+export function cancelEquipmentCrafting(
+  get: () => GameState,
+  set: (fn: (state: GameState) => Partial<GameState>) => void
+) {
+  set((state) => {
+    const progress = state.equipmentCraftingProgress;
+    if (!progress) return { currentAction: 'meditate' as const, equipmentCraftingProgress: null };
+
+    const cancelResult = CraftingEquipment.cancelEquipmentCrafting(
+      progress.blueprintId,
+      progress.manaSpent
+    );
+
+    return {
+      currentAction: 'meditate' as const,
+      equipmentCraftingProgress: null,
+      rawMana: state.rawMana + cancelResult.manaRefund,
+      log: [cancelResult.logMessage, ...state.log.slice(0, 49)],
+    };
+  });
+}
+
+export function deleteMaterial(
+  materialId: string,
+  amount: number,
+  get: () => GameState,
+  set: (fn: (state: GameState) => Partial<GameState>) => void
+) {
+  set((state) => {
+    const newMaterials = { ...state.lootInventory.materials };
+    const currentAmount = newMaterials[materialId] || 0;
+    const newAmount = Math.max(0, currentAmount - amount);
+
+    if (newAmount <= 0) {
+      delete newMaterials[materialId];
+    } else {
+      newMaterials[materialId] = newAmount;
+    }
+
+    return {
+      lootInventory: {
+        ...state.lootInventory,
+        materials: newMaterials,
+      },
+      log: [`🗑️ Deleted ${amount}x ${materialId}.`, ...state.log.slice(0, 49)],
+    };
+  });
+}