refactor: move use-theme store to stores

src/hooks/use-theme.ts

@@ -1,17 +1,4 @@
-import { create, StoreApi } from 'zustand';
-
-interface ThemeState {
-  theme: string;
-  setTheme: (theme: string) => void;
-}
-
-const useThemeStore = create<ThemeState>((set: StoreApi<ThemeState>['setState']) => ({
-  theme: localStorage.getItem('theme') || 'yotsuba',
-  setTheme: (theme: string) => {
-    localStorage.setItem('theme', theme);
-    set({ theme });
-  },
-}));
+import useThemeStore from '../stores/use-theme-store';
 
 const useTheme = (): [string, (theme: string) => void] => {
   const { theme, setTheme } = useThemeStore();