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/HubRegistry/Show.hs

@@ -11,7 +11,7 @@ import qualified Data.ByteString.Lazy.Char8 as BL
 
 -- | Row from the adopted patterns query.
 -- (patternId, patternName, widgetType, patternHubId, adoptionId, isVersionPinned, adoptedAt)
-type AdoptedPatternRow = (Id WidgetPattern, Text, Text, Id Hub, Id PatternAdoption, Bool, UTCTime)
+type AdoptedPatternRow = (Id WidgetPattern, Text, Text, Bool, UTCTime)
 
 data ShowView = ShowView
     { hub            :: !Hub
@@ -170,7 +170,7 @@ renderSnapshotRow s = [hsx|
 |]
 
 renderAdoptedPattern :: AdoptedPatternRow -> Html
-renderAdoptedPattern (patternId, patternName, widgetType, _, _, isPinned, adoptedAt) = [hsx|
+renderAdoptedPattern (patternId, patternName, widgetType, isPinned, adoptedAt) = [hsx|
     <div class="bg-white rounded border border-gray-200 p-3 flex items-center justify-between">
         <div>
             <a href={ShowWidgetPatternAction (patternId)}