feat(ST-qcmqlv2i): SSE + idea-store — user_question events verwerken

- IdeaUserQuestion type + UserQuestionEvent type in idea-store
- userQuestions state + initUserQuestions + handleUserQuestionEvent
- clearForIdea filtert ook userQuestions voor het idea
- IdeaJobKind uitgebreid met PLAN_CHAT
- notifications/route.ts: UserQuestionPayload, isUserQuestionPayload,
  user_question events forwarden naar SSE, userQuestionsInit in state-event
- use-notifications-realtime.ts: UserQuestionPayload handler +
  initUserQuestions aanroepen bij state-event

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

app/api/realtime/notifications/route.ts

@@ -49,23 +49,37 @@ interface IdeaJobPayload {
   idea_id: string
   user_id: string
   product_id?: string | null
-  kind: 'IDEA_GRILL' | 'IDEA_MAKE_PLAN'
+  kind: 'IDEA_GRILL' | 'IDEA_MAKE_PLAN' | 'PLAN_CHAT'
   status: string
 }
 
-type NotifyPayload = QuestionPayload | IdeaJobPayload
+// UserQuestion-payloads: emitted by app/api/user-questions/[id]/answer and
+// actions/user-questions.ts via prisma.$executeRaw pg_notify.
+interface UserQuestionPayload {
+  op: 'I' | 'U'
+  entity: 'user_question'
+  id: string
+  idea_id: string
+  status: 'pending' | 'answered'
+}
+
+type NotifyPayload = QuestionPayload | IdeaJobPayload | UserQuestionPayload
 
 function isQuestionPayload(p: NotifyPayload): p is QuestionPayload {
   return 'entity' in p && p.entity === 'question'
 }
 
+function isUserQuestionPayload(p: NotifyPayload): p is UserQuestionPayload {
+  return 'entity' in p && p.entity === 'user_question'
+}
+
 function isIdeaJobPayload(p: NotifyPayload): p is IdeaJobPayload {
   return (
     'type' in p &&
     (p.type === 'claude_job_enqueued' || p.type === 'claude_job_status') &&
     'idea_id' in p &&
     'kind' in p &&
-    (p.kind === 'IDEA_GRILL' || p.kind === 'IDEA_MAKE_PLAN')
+    (p.kind === 'IDEA_GRILL' || p.kind === 'IDEA_MAKE_PLAN' || p.kind === 'PLAN_CHAT')
   )
 }
 
@@ -164,6 +178,13 @@ export async function GET(request: NextRequest) {
           return
         }
 
+        // UserQuestion (PLAN_CHAT answer-event): user-scoped via idea ownership.
+        if (isUserQuestionPayload(payload)) {
+          if (!accessibleIdeaIds.has(payload.idea_id)) return
+          enqueue(`data: ${msg.payload}\n\n`)
+          return
+        }
+
         if (!isQuestionPayload(payload)) return
 
         // Idea-question: alleen voor de eigenaar van het idee.
@@ -264,7 +285,14 @@ export async function GET(request: NextRequest) {
         }),
       ].sort((a, b) => (a.created_at < b.created_at ? 1 : -1))
 
-      enqueue(`event: state\ndata: ${JSON.stringify({ questions: stateQuestions })}\n\n`)
+      const userQuestionsInit = await prisma.userQuestion.findMany({
+        where: { idea: { user_id: userId } },
+        orderBy: { created_at: 'desc' },
+        take: 100,
+        select: { id: true, idea_id: true, question: true, answer: true, status: true, created_at: true },
+      })
+
+      enqueue(`event: state\ndata: ${JSON.stringify({ questions: stateQuestions, userQuestions: userQuestionsInit.map(uq => ({ ...uq, created_at: uq.created_at.toISOString() })) })}\n\n`)
 
       heartbeatTimer = setInterval(() => {
         enqueue(`: heartbeat\n\n`)