✨ feat(vscode): 代码阅读页面画链式调用卡片：竖轨道、小链、收起的闭包和合成的表

链的各步排在值下面的竖轨道上，方法一列对齐、轨道线是函数色淡到 35%；实参是链的缩进成空心点小链，注释挂在步骤下；收起的闭包是能点的小框，点开那一步才画挂着的子块（折叠 id 记在属性行下面）；跳到定义、查找、高度估算、只看改动都算上链里的字和步骤下的子块

vscode/webview-ui/src/codeReader/diffView.ts

@@ -115,14 +115,14 @@ export function foldUnchanged(blocks: readonly BlockView[], tree: DiffTree, show
     }
     close()
   }
-  /** 一层子块：挂在父卡片子行上、点子行才展开的不折、只往里看改动，别的照常折 */
+  /** 一层子块：画在父卡片里的（挂在子行上、链式调用某一步下面，点开才展开）不折、只往里看改动，别的照常折 */
   function visit(list: readonly BlockView[], owner: string): void {
     const breaks = new Set((tree.removed.get(owner) ?? []).map(item => item.after))
     for (const block of list) {
-      if (block.slot && (tree.changes.has(block.id) || kept(block)))
+      if ((block.slot || block.step) && (tree.changes.has(block.id) || kept(block)))
         visit(block.children, block.id)
     }
-    visitRun(list.filter(block => !block.slot), breaks)
+    visitRun(list.filter(block => !block.slot && !block.step), breaks)
   }
   visit(blocks, '')
   return { runs, folded }