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/Sessions/New.hs

@@ -0,0 +1,40 @@
+module Web.View.Sessions.New where
+
+import Web.Types
+import Generated.Types
+import IHP.Prelude
+import IHP.ViewPrelude
+
+data NewView = NewView { user :: !User }
+
+instance View NewView where
+    html NewView { .. } = [hsx|
+        <div class="max-w-sm mx-auto mt-16">
+            <h1 class="text-2xl font-semibold mb-6">Sign in to inter-hub</h1>
+            <form method="POST" action={CreateSessionAction} class="space-y-4">
+                {forEach (getFlashMessages) renderFlash}
+                <div>
+                    <label class="block text-sm font-medium text-gray-700 mb-1">Email</label>
+                    <input type="email" name="email" required
+                           class="w-full border border-gray-300 rounded px-3 py-2 text-sm
+                                  focus:outline-none focus:ring-2 focus:ring-indigo-500" />
+                </div>
+                <div>
+                    <label class="block text-sm font-medium text-gray-700 mb-1">Password</label>
+                    <input type="password" name="password" required
+                           class="w-full border border-gray-300 rounded px-3 py-2 text-sm
+                                  focus:outline-none focus:ring-2 focus:ring-indigo-500" />
+                </div>
+                <button type="submit"
+                        class="w-full bg-indigo-600 text-white rounded px-4 py-2 text-sm font-medium
+                               hover:bg-indigo-700 focus:outline-none focus:ring-2 focus:ring-indigo-500">
+                    Sign in
+                </button>
+            </form>
+        </div>
+    |]
+
+renderFlash :: Text -> Html
+renderFlash msg = [hsx|
+    <div class="bg-red-50 border border-red-200 text-red-700 rounded px-3 py-2 text-sm">{msg}</div>
+|]