feat: 完善模型用量趋势与全局手账卡片并补齐阶段验收

frontend/src/features/editor/mermaidPreview.ts

@@ -1,13 +1,19 @@
 import { nextTick } from 'vue'
 import { renderMermaid } from '@/services/mermaidService'
 import { t } from '@/i18n'
+import { appendDiagramControls } from '@/utils/diagramControls'
 
 let previewId = 0
 export function createMermaidPreview(source: string, dark: boolean, applyPreview: (value: HTMLElement) => void): HTMLElement {
   // Each revision owns its element, so a slow render cannot replace newer content.
+  // Milkdown sanitizes Element input to its inner HTML; retain the revision
+  // marker and controls inside an otherwise disposable envelope.
+  const envelope = document.createElement('div')
   const container = document.createElement('div')
+  envelope.append(container)
   container.className = 'editor-mermaid-preview'
   container.id = `editor-mermaid-preview-${++previewId}`
+  envelope.dataset.previewId = container.id
   container.setAttribute('aria-live', 'polite')
   container.textContent = t('正在渲染图表…', 'Rendering diagram…')
   const publish = async () => {
@@ -18,7 +24,7 @@ export function createMermaidPreview(source: string, dark: boolean, applyPreview
     if (visible) {
       // PreviewPanel copies HTML instead of retaining the supplied element.
       // Update the current copy through Milkdown's reactive callback.
-      applyPreview(container.cloneNode(true) as HTMLElement)
+      applyPreview(envelope.cloneNode(true) as HTMLElement)
     }
   }
   void renderMermaid(source, { theme: dark ? 'dark' : 'light' }).then(result => {
@@ -30,10 +36,11 @@ export function createMermaidPreview(source: string, dark: boolean, applyPreview
     }
     // Mermaid runs in strict mode; Milkdown sanitizes the preview before insertion.
     container.innerHTML = result.svg
+    appendDiagramControls(container)
     void publish()
   }).catch(() => {
     container.textContent = t('图表渲染失败，请点击编辑检查源码。', 'Unable to render diagram. Choose Edit to inspect the source.')
     void publish()
   })
-  return container
+  return envelope
 }