fix(WP-0017/E3): Layer 3 error fixes — controllers and views

Fix compilation errors across 6 controllers and 29 views: import cleanup,
ResponseException pattern for API auth, type fixes, unused import removal.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Web/View/LineageEnrichment/Index.hs

@@ -36,7 +36,6 @@ instance View IndexView where
                     </p>
                 </div>
                 <form method="POST" action={EnrichLineageAction (h.id)}>
-                    {csrfTokenTag}
                     <button type="submit"
                         class="px-3 py-1.5 text-sm bg-green-600 text-white rounded hover:bg-green-700"
                         disabled={unenriched == 0}>