feat(frontend): Add UI for phase transition confirmation requests

When phase_guard is enabled and a supervisor tries to advance the contract
phase, users now see a confirmation modal with:
- Current and proposed next phase visualization
- Phase deliverables checklist (if available)
- Summary of the phase work
- Options to "Approve & Advance" or "Request Changes" with feedback

Components added:
- PhaseConfirmationModal: Full modal dialog for phase confirmations
- PhaseConfirmationInline: Inline variant for task output view
- PhaseConfirmationNotification: Global notification wrapper
- PhaseConfirmationToast: Alternative toast-style notification

Integration:
- Added phase_confirmation message type to TaskOutput renderer
- Extended PendingQuestion API type with phase confirmation data
- Integrated notification into main app layout

The UI uses the existing supervisor question infrastructure (polling via
/api/v1/mesh/questions) and responds with APPROVE or CHANGES_REQUESTED
prefixed feedback.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/makima/frontend/src/main.tsx b/makima/frontend/src/main.tsx
index 5fd6a4e..19f02d1 100644
--- a/makima/frontend/src/main.tsx
+++ b/makima/frontend/src/main.tsx
@@ -6,6 +6,7 @@ import { AuthProvider } from "./contexts/AuthContext";
 import { SupervisorQuestionsProvider } from "./contexts/SupervisorQuestionsContext";
 import { GridOverlay } from "./components/GridOverlay";
 import { SupervisorQuestionNotification } from "./components/SupervisorQuestionNotification";
+import { PhaseConfirmationNotification } from "./components/PhaseConfirmationNotification";
 import { ProtectedRoute } from "./components/ProtectedRoute";
 import HomePage from "./routes/_index";
 import ListenPage from "./routes/listen";
@@ -24,6 +25,7 @@ createRoot(document.getElementById("root")!).render(
         <BrowserRouter>
           <GridOverlay />
           <SupervisorQuestionNotification />
+          <PhaseConfirmationNotification />
           <Routes>
           <Route path="/" element={<HomePage />} />
           <Route path="/login" element={<LoginPage />} />