feat: add manual save mode to file editor

Added a persistent autosave toggle for file editing
Manual save mode applies across current and future opened files
Updated localized toolbar labels

packages/ui/src/lib/i18n/messages/ko.ts

@@ -854,7 +854,10 @@ export const dict: Record<I18nKey, string> = {
   'filesView.dialog.delete.confirm': '삭제',
   'filesView.editor.saving': '저장 중…',
   'filesView.editor.saved': '저장됨',
+  'filesView.editor.autoSaveOn': '자동 저장 켜짐',
+  'filesView.editor.manualSave': '수동 저장',
   'filesView.editor.saveNowTitle': '지금 저장({shortcut}) · 1.5초 후 자동 저장',
+  'filesView.editor.saveNowManualTitle': '지금 저장({shortcut})',
   'filesView.editor.saveAria': '저장 ({shortcut})',
   'filesView.editor.openInDesktopApp': '데스크톱 앱에서 열기',
   'filesView.editor.refreshApps': '앱 새로고침',