refactor(frontend): menuのdividerをnullで表現するのをやめる

packages/frontend/src/pages/settings/preferences-backups.vue

@@ -406,7 +406,7 @@ function menu(ev: MouseEvent, profileId: string) {
 		icon: 'ti ti-download',
 		href: URL.createObjectURL(new Blob([JSON.stringify(profiles.value[profileId], null, 2)], { type: 'application/json' })),
 		download: `${profiles.value[profileId].name}.json`,
-	}, null, {
+	}, { type: 'divider' }, {
 		text: ts.rename,
 		icon: 'ti ti-forms',
 		action: () => rename(profileId),
@@ -414,7 +414,7 @@ function menu(ev: MouseEvent, profileId: string) {
 		text: ts._preferencesBackups.save,
 		icon: 'ti ti-device-floppy',
 		action: () => save(profileId),
-	}, null, {
+	}, { type: 'divider' }, {
 		text: ts.delete,
 		icon: 'ti ti-trash',
 		action: () => deleteProfile(profileId),