test(admin): cover support fallback route and mark todo complete

e2e/support-auth.pw.ts

@@ -0,0 +1,20 @@
+import { expect, test } from "@playwright/test"
+
+const SUPPORT_LOGIN_KEY = process.env.CMS_SUPPORT_LOGIN_KEY ?? "support-access"
+
+test.describe("support fallback route", () => {
+  test("valid support key opens sign-in page", async ({ page }, testInfo) => {
+    test.skip(testInfo.project.name !== "admin-chromium")
+
+    await page.goto(`/support/${SUPPORT_LOGIN_KEY}`)
+
+    await expect(page.getByRole("heading", { name: /sign in to cms admin/i })).toBeVisible()
+  })
+
+  test("invalid support key returns not found", async ({ page }, testInfo) => {
+    test.skip(testInfo.project.name !== "admin-chromium")
+
+    const response = await page.goto("/support/invalid-key")
+    expect(response?.status()).toBe(404)
+  })
+})