슬래시 방향키 순환 계산 분리

components/admin/AdminMarkdownEditor.vue

@@ -48,6 +48,7 @@ import {
   clampSlashHighlightedIndex,
   filterSlashCommands,
   getMediaPickerKindFromSlashAction,
+  getNextSlashHighlightedIndex,
   getSlashCommandFocusTarget,
   getSlashCommandTextareaSelection,
   insertMarkdownLinesAtSlashTarget,
@@ -1461,11 +1462,11 @@ onMounted(() => {
             liveSlashKeyboardNav.value = false
           }, 200)
 
-          if (event.key === 'ArrowDown') {
-            liveSlashHighlightedIndex.value = (liveSlashHighlightedIndex.value + 1) % count
-          } else {
-            liveSlashHighlightedIndex.value = (liveSlashHighlightedIndex.value - 1 + count) % count
-          }
+          liveSlashHighlightedIndex.value = getNextSlashHighlightedIndex({
+            currentIndex: liveSlashHighlightedIndex.value,
+            commandCount: count,
+            key: event.key
+          })
         }
 
         return