refactor: organize desktop vs. mobile into separate folders

js/desktop/src/stores/session-store.ts

@@ -0,0 +1,23 @@
+import { create } from "zustand";
+
+const AUTH_TOKEN_KEY = "auth_token";
+
+interface SessionState {
+  token: string | null;
+  setToken: (token: string) => void;
+  clearToken: () => void;
+}
+
+export const useSessionStore = create<SessionState>((set) => ({
+  token: localStorage.getItem(AUTH_TOKEN_KEY),
+
+  setToken: (token: string) => {
+    localStorage.setItem(AUTH_TOKEN_KEY, token);
+    set({ token });
+  },
+
+  clearToken: () => {
+    localStorage.removeItem(AUTH_TOKEN_KEY);
+    set({ token: null });
+  },
+}));