feat: add Gemini and Spartan protocol support

app/lib/application/pages/settings_page.dart

@@ -107,6 +107,18 @@ Future<MewsPage> buildSettingsPage(
             current: variant == settings.variant.value,
           ),
       ]),
+      // Identities are their own page: a certificate is added from a file,
+      // which has no place among the presentation choices.
+      HeadingBlock(2, [MewsText(strings.t('settings-identities-heading'))]),
+      itemList([
+        MewsListItem([
+          ParagraphBlock([
+            MewsLink(MewsUrls.certificates, [
+              MewsText(strings.t('certificates-title')),
+            ]),
+          ]),
+        ]),
+      ]),
     ],
   );
 }