fix(worktrees): never leave the create-worktree dialog stuck on a stalled preflight (#33400)

* fix(worktrees): never leave the create-worktree dialog stuck on a stalled preflight

Bound the same-repo PR branch fetch with the review-head fetch timeout, and
hand a slow composer submit off to a staged sidebar row so the dialog closes.

* fix(worktrees): harden create-worktree handoff from adversarial review

Dedupe handed-off submits against linked creations resolved during preflight,
bound the staged sidebar row with a deadline, offer Reopen on handed-off
failures, and bound the GitLab MR branch fetch.

* test(worktrees): expect the bounded PR/MR branch fetch timeout

---------

Co-authored-by: OrcaWin <293788423+OrcaWin@users.noreply.github.com>

src/main/github/pr-head-tracking-ref.test.ts

@@ -29,7 +29,7 @@ describe('fetchPrHeadTrackingRef', () => {
 
     expect(gitExecFileAsyncMock).toHaveBeenCalledWith(
       ['fetch', 'origin', '+refs/heads/feature/x:refs/remotes/origin/feature/x'],
-      { cwd: '/repo' }
+      { cwd: '/repo', timeout: REVIEW_HEAD_FETCH_TIMEOUT_MS }
     )
   })
 

src/main/github/pr-head-tracking-ref.ts

@@ -30,7 +30,10 @@ export async function fetchPrHeadTrackingRef(
   }
   await gitExecFileAsync(
     ['fetch', remote, `+refs/heads/${branch}:refs/remotes/${remote}/${branch}`],
-    options.localGitExecOptions ?? { cwd: repo.path }
+    {
+      ...(options.localGitExecOptions ?? { cwd: repo.path }),
+      timeout: REVIEW_HEAD_FETCH_TIMEOUT_MS
+    }
   )
 }