fix：输入斜杠换出slash菜单后，按方向键向下切换菜单，超出容器可视区后，方向键可以继续切换，但是滚动条不跟随滚动

frontend/src/core/features/block_editor/menus/slash/SlashMenu.vue

@@ -27,6 +27,14 @@ watch(
   () => { selectedIndex.value = 0 },
 )
 
+// ★ 选中项变化时自动将其滚动到可视区
+watch(selectedIndex, () => {
+  nextTick(() => {
+    const active = menuEl.value?.querySelector('.blockeditor-slash-item-active')
+    if (active) active.scrollIntoView({ block: 'nearest' })
+  })
+})
+
 const groupedItems = computed(() => {
   const groups: Record<string, SlashCommandItem[]> = {}
   const cats = ['Text', 'Lists', 'Blocks', 'Media']