test: use createTestingPinia instead of createPinia (#8376)

Replace \createPinia\ with \createTestingPinia({ stubActions: false })\
from \@pinia/testing\ across 45 test files for proper test isolation.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8376-test-use-createTestingPinia-instead-of-createPinia-2f66d73d36508137a9f0daffcddc86f7)
by [Unito](https://www.unito.io)

Co-authored-by: Amp <amp@ampcode.com>

src/stores/firebaseAuthStore.test.ts

@@ -1,6 +1,7 @@
 import { FirebaseError } from 'firebase/app'
 import * as firebaseAuth from 'firebase/auth'
-import { createPinia, setActivePinia } from 'pinia'
+import { createTestingPinia } from '@pinia/testing'
+import { setActivePinia } from 'pinia'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 import * as vuefire from 'vuefire'
 
@@ -153,7 +154,7 @@ describe('useFirebaseAuthStore', () => {
     })
 
     // Initialize Pinia
-    setActivePinia(createPinia())
+    setActivePinia(createTestingPinia({ stubActions: false }))
     store = useFirebaseAuthStore()
 
     // Reset and set up getIdToken mock
@@ -175,7 +176,7 @@ describe('useFirebaseAuthStore', () => {
 
       vi.mocked(vuefire.useFirebaseAuth).mockReturnValue(mockAuth as any)
 
-      setActivePinia(createPinia())
+      setActivePinia(createTestingPinia({ stubActions: false }))
       store = useFirebaseAuthStore()
     })