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/en.ts

@@ -851,7 +851,10 @@ export const dict = {
   'filesView.dialog.delete.confirm': 'Delete',
   'filesView.editor.saving': 'Saving...',
   'filesView.editor.saved': 'Saved',
+  'filesView.editor.autoSaveOn': 'Auto-save on',
+  'filesView.editor.manualSave': 'Manual save',
   'filesView.editor.saveNowTitle': 'Save now ({shortcut}) - auto-saves after 1.5s',
+  'filesView.editor.saveNowManualTitle': 'Save now ({shortcut})',
   'filesView.editor.saveAria': 'Save ({shortcut})',
   'filesView.editor.openInDesktopApp': 'Open in desktop app',
   'filesView.editor.refreshApps': 'Refresh Apps',