fix: update SpellsTab to use modular stores, fixing tab crash

src/components/game/tabs/SpellsTab.tsx

@@ -1,34 +1,44 @@
 'use client';
 
+import { useCombatStore, useManaStore, useSkillStore } from '@/lib/game/stores';
 import { GameCard, ElementBadge } from '@/components/ui';
 import { Badge } from '@/components/ui/badge';
 import { ELEMENTS, SPELLS_DEF } from '@/lib/game/constants';
 import { ENCHANTMENT_EFFECTS } from '@/lib/game/data/enchantment-effects';
-import { canAffordSpellCost } from '@/lib/game/store';
+import { canAffordSpellCost } from '@/lib/game/stores';
 import { formatSpellCost, getSpellCostColor } from '@/lib/game/formatting';
 
-interface SpellsTabProps {
-  store: {
-    spells: Record<string, { learned: boolean; level: number; studyProgress: number }>;
-    equippedInstances: Record<string, string | null>;
-    equipmentInstances: Record<string, { instanceId: string; name: string; enchantments: { effectId: string; stacks: number }[] }>;
-    activeSpell: string;
-    rawMana: number;
-    elements: Record<string, { current: number; max: number; unlocked: boolean }>;
-    signedPacts: number[];
-    unlockedEffects: string[];
-    setSpell: (spellId: string) => void;
-  };
-}
+export function SpellsTab() {
+  // Use modular stores directly
+  const spells = useCombatStore((s) => s.spells);
+  const activeSpell = useCombatStore((s) => s.activeSpell);
+  const setSpell = useCombatStore((s) => s.setSpell);
+  
+  const equippedInstances = useCombatStore((s) => s.equippedInstances);
+  const equipmentInstances = useCombatStore((s) => s.equipmentInstances);
+  
+  const rawMana = useManaStore((s) => s.rawMana);
+  const elements = useManaStore((s) => s.elements);
+  
+  const signedPacts = useSkillStore((s) => s.signedPacts);
+  const unlockedEffects = useSkillStore((s) => s.unlockedEffects);
 
-export function SpellsTab({ store }: SpellsTabProps) {
   // Get spells from equipment
   const equipmentSpellIds: string[] = [];
   const spellSources: Record<string, string[]> = {};
   
-  for (const instanceId of Object.values(store.equippedInstances)) {
+  // Guard against undefined stores during initialization
+  if (!equippedInstances || !equipmentInstances) {
+    return (
+      <div className="p-4 text-center text-[var(--text-muted)]">
+        Loading spell data...
+      </div>
+    );
+  }
+  
+  for (const instanceId of Object.values(equippedInstances)) {
     if (!instanceId) continue;
-    const instance = store.equipmentInstances[instanceId];
+    const instance = equipmentInstances[instanceId];
     if (!instance) continue;
     
     for (const ench of instance.enchantments) {
@@ -49,10 +59,10 @@ export function SpellsTab({ store }: SpellsTabProps) {
   const canCastSpell = (spellId: string): boolean => {
     const spell = SPELLS_DEF[spellId];
     if (!spell || !spell.cost) return false;
-    return canAffordSpellCost(spell.cost, store.rawMana, store.elements);
+    return canAffordSpellCost(spell.cost, rawMana, elements);
   };
   
-  const hasPactSpells = store.signedPacts.length > 0;
+  const hasPactSpells = signedPacts && signedPacts.length > 0;
   
   return (
     <div className="space-y-6">
@@ -72,7 +82,7 @@ export function SpellsTab({ store }: SpellsTabProps) {
               const def = SPELLS_DEF[id];
               if (!def) return null;
               
-              const isActive = store.activeSpell === id;
+              const isActive = activeSpell === id;
               const canCast = canCastSpell(id);
               const elemDef = def.elem === 'raw' ? null : ELEMENTS[def.elem];
               const sources = spellSources[id] || [];
@@ -116,7 +126,7 @@ export function SpellsTab({ store }: SpellsTabProps) {
                       ) : (
                         <button
                           className="px-3 py-1 text-xs border border-[var(--border-default)] rounded hover:border-[var(--border-focus)] transition-colors"
-                          onClick={() => store.setSpell(id)}
+                          onClick={() => setSpell(id)}
                         >
                           Set Active
                         </button>
@@ -169,7 +179,7 @@ export function SpellsTab({ store }: SpellsTabProps) {
         <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
           {Object.entries(SPELLS_DEF).map(([id, def]) => {
             const elemDef = def.elem === 'raw' ? null : ELEMENTS[def.elem];
-            const isUnlocked = store.unlockedEffects?.includes(`spell_${id}`);
+            const isUnlocked = unlockedEffects?.includes(`spell_${id}`);
             
             return (
               <GameCard