Add missing pages to showcase (#906)

This adds two pages that are present in the screenshot tests, but which
weren't yet shown on the showcase. This means that all screenshot pages can now be browsed on the showcase.

src/frontend/src/showcase.ts

@@ -17,6 +17,7 @@ import { styleguide } from "./styleguide";
 import { compatibilityNotice } from "./flows/compatibilityNotice";
 import { aboutView } from "./flows/about";
 import { faqView } from "./flows/faq";
+import { showWarning } from "./banner";
 import { displayUserNumber } from "./flows/displayUserNumber";
 import { loginKnownAnchor } from "./flows/login/knownAnchor";
 import { loginUnknownAnchor } from "./flows/login/unknownAnchor";
@@ -144,6 +145,8 @@ const iiPages: Record<string, () => void> = {
       ...simpleDevices,
       recoveryPhrase,
     ]),
+  displayManageSingle: () =>
+    displayManage(userNumber, dummyConnection, [simpleDevices[0]]),
   chooseDeviceAddFlow: () => chooseDeviceAddFlow(),
   renderPollForTentativeDevicePage: () =>
     renderPollForTentativeDevicePage(userNumber),
@@ -185,6 +188,10 @@ const iiPages: Record<string, () => void> = {
       primaryButton: "Try again",
     }),
   promptUserNumber: () => promptUserNumber("hello", null),
+  banner: () => {
+    loginUnknownAnchor(dummyConnection);
+    showWarning(html`This is a test page, be very careful!`);
+  },
 };
 
 // The showcase