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/Controller/HubRegistry.hs

@@ -30,8 +30,7 @@ instance Controller HubRegistryController where
             |> limit 10
             |> fetch
         adoptedPatterns <- sqlQuery
-            "SELECT wp.id, wp.name, wp.widget_type, wp.hub_id, \
-            \       pa.id AS adoption_id, pa.is_version_pinned, pa.adopted_at \
+            "SELECT wp.id, wp.name, wp.widget_type, pa.is_version_pinned, pa.adopted_at \
             \ FROM pattern_adoptions pa \
             \ JOIN widget_patterns wp ON wp.id = pa.widget_pattern_id \
             \ WHERE pa.adopting_hub_id = ? \