🐛 fix(vscode): 调用树按钮一直显示，点开时没数到就当场再查

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

@@ -1,5 +1,6 @@
 import type { ReactElement } from 'react'
 import { Eye, GitBranch, MessageSquareText, Pencil, Sparkles } from 'lucide-react'
+import { cn } from '@/lib/utils'
 
 /** 「重写注释」按钮的样子和动作：fresh 是块还没有注释、点了新写一段；正在重写时不能再点。 */
 export interface RewriteTool {
@@ -23,7 +24,7 @@ export function BlockTools({ editing, onToggleEdit, asking, onToggleAsk, rewrite
   onToggleAsk?: () => void
   /** 没给就不显示「按注释规范重写」（不能写注释的块） */
   rewrite?: RewriteTool
-  /** 没给，或棵数是 0，就不显示调用树（还没查到、没有调用者、语言不提供） */
+  /** 没给就不显示调用树。count 是后台数出的棵数，大于 0 时按钮上带这个数字，是 0 时只有图标（还没数到、没有调用者，点开时会当场再问） */
   callTree?: { anchor: string, count: number, open: boolean, onOpen: () => void }
 }): ReactElement {
   const label = editing ? '预览' : '编辑'
@@ -67,10 +68,10 @@ export function BlockTools({ editing, onToggleEdit, asking, onToggleAsk, rewrite
       >
         <Icon size={14} strokeWidth={1.8} aria-hidden />
       </button>
-      {callTree && callTree.count > 0 && (
+      {callTree && (
         <button
           type="button"
-          className="cr-tool flex h-5 items-center justify-center gap-px rounded px-1"
+          className={cn('cr-tool flex h-5 items-center justify-center rounded', callTree.count > 0 ? 'gap-px px-1' : 'w-6')}
           data-call-tree={callTree.anchor}
           data-active={callTree.open ? '' : undefined}
           data-tooltip="调用树"
@@ -79,7 +80,7 @@ export function BlockTools({ editing, onToggleEdit, asking, onToggleAsk, rewrite
           onClick={callTree.onOpen}
         >
           <GitBranch size={14} strokeWidth={1.8} aria-hidden />
-          <span className="cr-call-count">{callTree.count}</span>
+          {callTree.count > 0 && <span className="cr-call-count">{callTree.count}</span>}
         </button>
       )}
     </div>