feat(T02-T11): IHF Phase 1 schema, controllers, views, and helpers

- Schema: hubs, widgets, widget_versions, interaction_events (append-only
  trigger), annotations, users — single migration file
- Web layer: Types, Routes, FrontController with auth + AutoRefresh layout
- Controllers: Hubs (CRUD), Widgets (CRUD + versioning), InteractionEvents
  (JSON capture, canonical event_type validation), Annotations (threaded,
  append-only)
- Sessions controller for IHP auth
- Views: Hubs (index/show/new/edit), Widgets (index/show/new/edit),
  Annotations (index/new), Sessions (login)
- widgetEnvelope helper with full data-* governance attributes
- Integration tests: Hub CRUD, Widget versioning, event capture, append-only
  guard, annotation threading, validation

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

Web/View/Annotations/Index.hs

@@ -0,0 +1,61 @@
+module Web.View.Annotations.Index where
+
+import Web.Types
+import Generated.Types
+import IHP.Prelude
+import IHP.ViewPrelude
+
+data IndexView = IndexView
+    { widget      :: !Widget
+    , annotations :: ![Annotation]
+    }
+
+instance View IndexView where
+    html IndexView { .. } = [hsx|
+        <div class="mb-6 flex items-center gap-2 text-sm text-gray-500">
+            <a href={WidgetsAction} class="hover:text-gray-700">Widgets</a>
+            <span>/</span>
+            <a href={ShowWidgetAction { widgetId = widget.id }} class="hover:text-gray-700">{widget.name}</a>
+            <span>/</span>
+            <span>Annotations</span>
+        </div>
+
+        <div class="flex items-center justify-between mb-4">
+            <h1 class="text-2xl font-semibold">Annotations for {widget.name}</h1>
+            <a href={NewAnnotationAction { widgetId = widget.id }}
+               class="bg-indigo-600 text-white text-sm font-medium px-4 py-2 rounded hover:bg-indigo-700">
+                Add Annotation
+            </a>
+        </div>
+
+        <div class="space-y-3">
+            {forEach rootAnnotations (renderAnnotation childrenOf)}
+        </div>
+    |]
+  where
+    rootAnnotations = filter (\a -> isNothing a.parentId) annotations
+    childrenOf parent = filter (\a -> a.parentId == Just parent.id) annotations
+
+renderAnnotation :: (Annotation -> [Annotation]) -> Annotation -> Html
+renderAnnotation childrenOf a = [hsx|
+    <div class="bg-white rounded-lg border border-gray-200 px-4 py-3">
+        <div class="flex items-center gap-2 mb-2">
+            <span class="text-xs bg-gray-100 text-gray-600 px-2 py-0.5 rounded font-medium">
+                {a.category}
+            </span>
+            <span class="text-xs text-gray-400">{a.actorType}</span>
+            {if isJust a.retractedAt
+                then [hsx|<span class="text-xs text-red-400 italic">retracted</span>|]
+                else mempty}
+            <span class="ml-auto text-xs text-gray-300">{show a.createdAt}</span>
+        </div>
+        <p class="text-sm text-gray-700">{a.body}</p>
+        <div class="mt-2 flex gap-2">
+            <a href={NewAnnotationAction { widgetId = a.widgetId }}
+               class="text-xs text-indigo-500 hover:text-indigo-700">Reply</a>
+        </div>
+        <div class="ml-6 mt-3 space-y-3">
+            {forEach (childrenOf a) (renderAnnotation childrenOf)}
+        </div>
+    </div>
+|]

Web/View/Annotations/New.hs

@@ -0,0 +1,44 @@
+module Web.View.Annotations.New where
+
+import Web.Types
+import Generated.Types
+import IHP.Prelude
+import IHP.ViewPrelude
+
+data NewView = NewView
+    { widget     :: !Widget
+    , annotation :: !Annotation
+    }
+
+instance View NewView where
+    html NewView { .. } = [hsx|
+        <div class="max-w-lg">
+            <div class="flex items-center gap-2 text-sm text-gray-500 mb-4">
+                <a href={ShowWidgetAction { widgetId = widget.id }} class="hover:text-gray-700">{widget.name}</a>
+                <span>/</span>
+                <a href={WidgetAnnotationsAction { widgetId = widget.id }} class="hover:text-gray-700">Annotations</a>
+                <span>/</span>
+                <span>New</span>
+            </div>
+            <h1 class="text-2xl font-semibold mb-6">Add Annotation</h1>
+            {renderForm annotation widget.id}
+        </div>
+    |]
+
+renderForm :: Annotation -> Id Widget -> Html
+renderForm annotation widgetId = formFor annotation [hsx|
+    {(textareaField #body) { fieldLabel = "Comment" }}
+    {selectField #category categoryOptions}
+    {submitButton}
+|]
+
+categoryOptions :: [(Text, Text)]
+categoryOptions =
+    [ ("Friction",        "friction")
+    , ("Defect",          "defect")
+    , ("Wish",            "wish")
+    , ("Policy Concern",  "policy_concern")
+    , ("Documentation Gap", "doc_gap")
+    , ("Trust",           "trust")
+    , ("Other",           "other")
+    ]