Implemented phase 2 for the POC prototype in the Website service.

Services/Website/Tests/Library/Cases/Internal/Components/SiteHeaderTests.swift

@@ -33,6 +33,8 @@ struct SiteHeaderTests {
         #expect(html.contains(#"aria-label="Messages, 3 unread""#))
         #expect(html.contains(#"href="/sell""#))
         #expect(html.contains(">MV<"))
+        #expect(html.contains(">Mara<"))
+        #expect(html.contains(#"action="/sign-out" method="post""#))
         #expect(!html.contains(#"href="/sign-in""#))
     }