✨ feat(vscode): 有说明的函数、类卡片也能重写注释

重写按钮不再只挂在单独的注释卡片上。只替换说明那几行，上下文用这块代码，不当成文件顶上的说明。

vscode/webview-ui/src/codeReader/BlockTree.tsx

@@ -291,7 +291,7 @@ function BlockCard({ block, tree }: { block: BlockView, tree: BlockTreeState }):
         asking={tree.qa?.state.open.includes(block.anchor)}
         onToggleAsk={tree.qa && (() => tree.qa?.onToggle(block.anchor))}
         rewriting={tree.rewrites.get(block.anchor)?.status === 'running'}
-        onRewrite={block.kind === 'comment' ? () => tree.onRewriteComment(block.anchor) : undefined}
+        onRewrite={block.commentStartLine !== undefined ? () => tree.onRewriteComment(block.anchor) : undefined}
       />
     </div>
   )