fix(e2e): await route mocks and add session mocking to all tests

- Make mockAuthRoutes async and await all page.route() calls to prevent race conditions
- Add auth route mocking to J8 unauth tests (required since VITE_MOCK_AUTH was removed)
- Add auth route mocking to smoke test
- Replace broken mockSessionPending with mockSessionDelayed for spinner test

Co-Authored-By: Paperclip <noreply@paperclip.ing>

e2e/smoke.spec.ts

@@ -1,8 +1,8 @@
-import { test, expect } from './fixtures';
+import { test, expect, mockAuthRoutes } from './fixtures';
 
 test('app loads', async ({ page }) => {
+  await mockAuthRoutes(page, false);
   await page.goto('/');
-  // Unauthenticated users are redirected to /login
   await expect(page).toHaveURL(/\/login/);
   await expect(page.getByRole('heading', { name: /CartSnitch/i })).toBeVisible();
 });