add anonymous mode UI

src/hooks/stores/useGeneralStore.js

@@ -1,6 +1,9 @@
 import { create } from 'zustand';
 
 const useGeneralStore = create((set) => ({
+  anonymousMode: true,
+  setAnonymousMode: (mode) => set({ anonymousMode: mode }),
+
   bodyStyle: JSON.parse(localStorage.getItem('bodyStyle')) || {
     background: '#ffe url(assets/fade.png) top repeat-x',
     color: 'maroon',