fix(e2e): fix test failures after CTO review

- Scope STAFF VIEW locator to impersonation-banner testid
- Fix loading state test: unroute before setting delayed handler

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

apps/e2e/tests/login.spec.ts

@@ -14,9 +14,9 @@ test.describe("DevLoginSelector", () => {
   });
 
   test("shows loading state while fetching users", async ({ page }) => {
+    await page.unroute("**/api/dev/users");
     await page.route("**/api/dev/users", async (route) => {
-      await page.waitForResponse((res) => res.url().includes("/api/dev/users"));
-      await new Promise((r) => setTimeout(r, 100));
+      await new Promise((r) => setTimeout(r, 200));
       await route.fulfill({ json: { staff: [], clients: [] } });
     });
     await page.goto("/login");