[API Node] Set auth persistence in local stoarge (#3514)

Author: christian-byrne

src/stores/firebaseAuthStore.ts

@@ -4,8 +4,10 @@ import {
   GoogleAuthProvider,
   type User,
   type UserCredential,
+  browserLocalPersistence,
   createUserWithEmailAndPassword,
   onAuthStateChanged,
+  setPersistence,
   signInWithEmailAndPassword,
   signInWithPopup,
   signOut
@@ -33,6 +35,9 @@ export const useFirebaseAuthStore = defineStore('firebaseAuth', () => {
   // Get auth from VueFire and listen for auth state changes
   const auth = useFirebaseAuth()
   if (auth) {
+    // Set persistence to localStorage (works in both browser and Electron)
+    void setPersistence(auth, browserLocalPersistence)
+
     onAuthStateChanged(auth, (user) => {
       currentUser.value = user
       isInitialized.value = true

tests-ui/tests/store/firebaseAuthStore.test.ts

@@ -16,7 +16,9 @@ vi.mock('firebase/auth', () => ({
   onAuthStateChanged: vi.fn(),
   signInWithPopup: vi.fn(),
   GoogleAuthProvider: vi.fn(),
-  GithubAuthProvider: vi.fn()
+  GithubAuthProvider: vi.fn(),
+  browserLocalPersistence: 'browserLocalPersistence',
+  setPersistence: vi.fn().mockResolvedValue(undefined)
 }))
 
 describe('useFirebaseAuthStore', () => {
@@ -64,6 +66,13 @@ describe('useFirebaseAuthStore', () => {
     expect(store.error).toBe(null)
   })
 
+  it('should set persistence to local storage on initialization', () => {
+    expect(firebaseAuth.setPersistence).toHaveBeenCalledWith(
+      mockAuth,
+      firebaseAuth.browserLocalPersistence
+    )
+  })
+
   it('should properly clean up error state between operations', async () => {
     // First, cause an error
     const mockError = new Error('Invalid password')