fix(mission): reconnect SSE stream after submitting interview response

After handleSubmitResponse posted an answer, the stream connection was
never re-established, so the next question from the server was never
received. The modal would stay on the loading spinner until the user
closed and reopened it (which triggered the resume-session reconnect).

Fix: call connectToMissionInterviewStream(sessionId) before the API
call, matching the pattern used by handleRetryFromError. Also close
the stream on API error to match the error-recovery path, and add
connectToMissionInterviewStream to the useCallback dependency array.

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

packages/dashboard/app/components/MissionInterviewModal.tsx

@@ -569,14 +569,17 @@ export function MissionInterviewModal({
       setStreamingOutput("");
 
       try {
+        connectToMissionInterviewStream(sessionId);
         await respondToMissionInterview(sessionId, responses, projectId, sessionTabId);
         setHasProgress(true);
       } catch (err: any) {
+        streamConnectionRef.current?.close();
+        streamConnectionRef.current = null;
         setError(err.message || "Failed to submit response");
         setView({ type: "question", sessionId, question: view.question });
       }
     },
-    [view, projectId, sessionTabId]
+    [view, projectId, sessionTabId, connectToMissionInterviewStream]
   );
 
   const handleRetryFromError = useCallback(async () => {