Mobile App design

apps/frontend-mobile/store/themeStore.ts

@@ -0,0 +1,30 @@
+import { create } from 'zustand';
+import AsyncStorage from '@react-native-async-storage/async-storage';
+
+export type ThemeMode = 'light' | 'dark' | 'system';
+
+interface ThemeState {
+  mode: ThemeMode;
+  setMode: (mode: ThemeMode) => Promise<void>;
+  init: () => Promise<void>;
+}
+
+const STORAGE_KEY = '@theme_mode';
+
+export const useThemeStore = create<ThemeState>((set) => ({
+  mode: 'system',
+
+  setMode: async (mode: ThemeMode) => {
+    set({ mode });
+    await AsyncStorage.setItem(STORAGE_KEY, mode);
+  },
+
+  init: async () => {
+    try {
+      const saved = await AsyncStorage.getItem(STORAGE_KEY);
+      if (saved === 'light' || saved === 'dark' || saved === 'system') {
+        set({ mode: saved });
+      }
+    } catch {}
+  },
+}));