[frontend] use shadcn

client/src/store/use-app-store.ts

@@ -0,0 +1,23 @@
+import { create } from "zustand";
+
+import type { Point } from "@/types/api";
+
+type Nullable<T> = T | null;
+
+interface AppState {
+  userLocation: Nullable<Point>;
+  locationError: Nullable<string>;
+  isRequestingLocation: boolean;
+  setUserLocation: (location: Nullable<Point>) => void;
+  setLocationError: (error: Nullable<string>) => void;
+  setIsRequestingLocation: (isRequesting: boolean) => void;
+}
+
+export const useAppStore = create<AppState>(set => ({
+  userLocation: null,
+  locationError: null,
+  isRequestingLocation: false,
+  setUserLocation: userLocation => set({ userLocation }),
+  setLocationError: locationError => set({ locationError }),
+  setIsRequestingLocation: isRequestingLocation => set({ isRequestingLocation }),
+}));