게시물 라이브 편집 블록 동작 개선

components/content/ContentMarkdownToggleEditor.vue

@@ -137,7 +137,9 @@ const onExitBelow = (payload) => {
       enter-mode="multiline"
       navigation-scope="parent"
       plain-text
+      arrow-exit-creates-line
       :source-line="bodySourceLine"
+      :source-line-count="String(modelValue ?? '').split('\n').length"
       :model-value="modelValue"
       @commit="onBodyCommit"
       @insert-below="onExitBelow"