🐛 fix(vscode): issue/patch 用 null 清空 worktree 字段以便 webview 即时刷新

vscode/src/panel/handlers/issues.ts

@@ -541,16 +541,16 @@ export async function handleColumnChange(panel: KanbanWebviewPanel, issueNumber:
     })
   }
 
-  // 6. 全部成功 → 增量推 done + 清掉 worktreePath/branch + 标记 prMerged。
-  // webview 端 `{ ...issue, ...patch }` spread 会把 worktreePath 覆盖成
-  // undefined，详情面板的 worktree 链接行因此消失。
+  // 6. 全部成功 → 增量推 done + 用 null 清空 worktreePath/branch（postMessage 会丢 undefined key）
+  // 并带 worktreeExists: false，详情「工作树」行即时变为只读/—。
   panel.postMessage({
     type: 'issue/patch',
     issueNumber,
     patch: {
       column: 'done',
-      worktreePath: undefined,
-      branch: undefined,
+      worktreePath: null,
+      branch: null,
+      worktreeExists: false,
       prMerged: true,
       prMergedAt: pullRequest.merged_at ?? new Date().toISOString(),
     },