Block Editor优化：在内容区滚动时，滚动到对应的标题时，右边对应的导航线图标点亮

frontend/src/core/features/block_editor/menus/BlockOutlineRail.vue

@@ -37,6 +37,7 @@ const popupStyle = ref<Record<string, string>>({})
 // 只显示 Heading 块
 const headingBlocks = computed(() => blocks.value.filter(b => b.type === 'heading'))
 
+let scrollContainer: HTMLElement | Window = window
 let scrollHandler: (() => void) | null = null
 let leaveTimer: ReturnType<typeof setTimeout> | null = null
 let rafId: number | null = null
@@ -327,7 +328,15 @@ onMounted(() => {
     syncActive()
     updateRailPosition()
   }
-  window.addEventListener('scroll', scrollHandler, { passive: true })
+
+  // 绑定到实际可滚动容器（不一定是 window，例如 Naive UI Layout 的嵌套滚动区）
+  const editorDom = props.editor.view.dom as HTMLElement
+  scrollContainer = findScrollContainer(editorDom)
+  if (scrollContainer === window) {
+    window.addEventListener('scroll', scrollHandler, { passive: true })
+  } else {
+    ;(scrollContainer as HTMLElement).addEventListener('scroll', scrollHandler, { passive: true })
+  }
   window.addEventListener('resize', scrollHandler, { passive: true })
 
   props.editor.on('update', () => {
@@ -337,14 +346,17 @@ onMounted(() => {
   })
 
   // 用户点击编辑器内容区时，清除高亮（与 Notion 行为一致）
-  const editorDom = props.editor.view.dom as HTMLElement
   onEditorMouseDown = () => { updateActiveHighlight(null) }
   editorDom.addEventListener('mousedown', onEditorMouseDown)
 })
 
 onBeforeUnmount(() => {
   if (scrollHandler) {
-    window.removeEventListener('scroll', scrollHandler)
+    if (scrollContainer === window) {
+      window.removeEventListener('scroll', scrollHandler)
+    } else {
+      ;(scrollContainer as HTMLElement).removeEventListener('scroll', scrollHandler)
+    }
     window.removeEventListener('resize', scrollHandler)
   }
   if (leaveTimer) clearTimeout(leaveTimer)