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/GovernanceTemplates/New.hs

@@ -22,7 +22,6 @@ instance View NewView where
         <h1 class="text-2xl font-semibold mb-6">New Governance Template</h1>
 
         <form method="POST" action={CreateGovernanceTemplateAction}>
-            {csrfTokenFormField}
             <div class="space-y-4 max-w-lg">
                 <div>
                     <label class="block text-sm font-medium text-gray-700 mb-1">Name</label>