fix: persist CraftingTab sub-tab selection across tab navigation

- Add activeCraftingSubTab state + setActiveCraftingSubTab action to
  craftingStore (persisted to localStorage via zustand persist middleware)
- Add CraftingAttunement type to craftingStore.types and re-export from
  stores/index.ts barrel
- Update CraftingTab.tsx to read/write active sub-tab from store instead
  of local useState, so selection survives component remount
- Add default 'fabricator' value in craft-initial-state.ts

src/components/game/tabs/CraftingTab.tsx

@@ -1,14 +1,13 @@
 'use client';
 
-import { useState } from 'react';
 import clsx from 'clsx';
 import { Hammer, Sparkles } from 'lucide-react';
 import { DebugName } from '@/components/game/debug/debug-context';
+import { useCraftingStore } from '@/lib/game/stores/craftingStore';
+import type { CraftingAttunement } from '@/lib/game/stores/craftingStore.types';
 import { FabricatorSubTab } from './CraftingTab/FabricatorSubTab';
 import { EnchanterSubTab } from './CraftingTab/EnchanterSubTab';
 
-type CraftingAttunement = 'fabricator' | 'enchanter';
-
 interface CraftingSubTab {
   key: CraftingAttunement;
   label: string;
@@ -21,7 +20,8 @@ const CRAFTING_SUB_TABS: CraftingSubTab[] = [
 ];
 
 export function CraftingTab() {
-  const [activeSubTab, setActiveSubTab] = useState<CraftingAttunement>('fabricator');
+  const activeSubTab = useCraftingStore((s) => s.activeCraftingSubTab);
+  const setActiveSubTab = useCraftingStore((s) => s.setActiveCraftingSubTab);
 
   return (
     <DebugName name="CraftingTab">