Fix BUG 2: Set currentAction to 'study' when starting skill or spell study

The startStudyingSkill() and startStudyingSpell() functions in skillStore.ts
were setting currentStudyTarget but not updating currentAction in combatStore.
Added useCombatStore.getState().setAction('study') calls to both functions
so the game tick properly processes study progress.

src/components/game/tabs/SpellsTab.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useCombatStore, useCraftingStore, useManaStore, useSkillStore } from '@/lib/game/stores';
+import { useCombatStore, useCraftingStore, useManaStore, usePrestigeStore } from '@/lib/game/stores';
 import { GameCard, ElementBadge } from '@/components/ui';
 import { Badge } from '@/components/ui/badge';
 import { ELEMENTS, SPELLS_DEF } from '@/lib/game/constants';
@@ -20,8 +20,8 @@ export function SpellsTab() {
   const rawMana = useManaStore((s) => s.rawMana);
   const elements = useManaStore((s) => s.elements);
   
-  const signedPacts = useSkillStore((s) => s.signedPacts);
-  const unlockedEffects = useSkillStore((s) => s.unlockedEffects);
+  const signedPacts = usePrestigeStore((s) => s.signedPacts);
+  const unlockedEffects = useCraftingStore((s) => s.unlockedEffects);
 
   // Get spells from equipment
   const equipmentSpellIds: string[] = [];
@@ -109,7 +109,7 @@ export function SpellsTab() {
                     <div className="text-xs text-[var(--text-secondary)]">
                       {def.elem !== 'raw' && (
                         <span className="mr-2">
-                          <ElementBadge elementId={def.elem} size="sm" /> {elemDef?.name}
+                          <ElementBadge element={def.elem} size="sm" /> {elemDef?.name}
                         </span>
                       )}
                       <span>⚔️ {def.dmg} dmg</span>
@@ -213,7 +213,7 @@ export function SpellsTab() {
                   <div className="text-xs text-[var(--text-secondary)]">
                     {def.elem !== 'raw' && (
                       <span className="mr-2">
-                        <ElementBadge elementId={def.elem} size="sm" /> {elemDef?.name}
+                        <ElementBadge element={def.elem} size="sm" /> {elemDef?.name}
                       </span>
                     )}
                     <span>⚔️ {def.dmg} dmg</span>