Perfect! I've fixed the hook invalidation issue. (#1309)

The problem was that after rebasing, the `useRebase` hook wasn't invalidating the `taskAttempt` query, so the Create PR dialog would read stale `target_branch` data from the cache. I added the missing invalidation at `frontend/src/hooks/useRebase.ts:43-46`, matching the pattern already used correctly in `useChangeTargetBranch.ts`.

Now when a user rebases via the UI, the task attempt query will be invalidated and the Create PR dialog will show the updated target/base branch.

frontend/src/hooks/useRebase.ts

@@ -40,6 +40,11 @@ export function useRebase(
           queryKey: ['branchStatus', attemptId],
         });
 
+        // Invalidate taskAttempt query to refresh attempt.target_branch
+        queryClient.invalidateQueries({
+          queryKey: ['taskAttempt', attemptId],
+        });
+
         // Refresh branch list used by PR dialog
         if (projectId) {
           queryClient.invalidateQueries({