fix: update storage key in theme store to use AppStorageKey.THEME

apps/web/src/core/stores/theme.store.ts

@@ -1,6 +1,7 @@
 import { create } from 'zustand';
 import { persist, createJSONStorage } from 'zustand/middleware';
 import type { ColorSchemeType } from '@repo/ui/provider';
+import { AppStorageKey } from '../storage/local';
 
 interface ThemeState {
   colorScheme: ColorSchemeType;
@@ -22,7 +23,7 @@ export const useThemeStore = create<ThemeState>()(
       setColorScheme: (scheme) => set({ colorScheme: scheme }),
     }),
     {
-      name: 'app_theme', // matches AppStorageKey.THEME
+      name: AppStorageKey.THEME, // matches AppStorageKey.THEME
       storage: createJSONStorage(() => localStorage),
     },
   ),