feat: 過去のノートを非公開化/フォロワーのみ表示可能にできる機能 (#14814)

* wip

* Update CHANGELOG.md

* wip

* wip

* wip

* Update privacy.vue

* wip

packages/frontend/src/components/MkSelect.vue

@@ -46,7 +46,7 @@ import type { MenuItem } from '@/types/menu.js';
 import * as os from '@/os.js';
 
 const props = defineProps<{
-	modelValue: string | null;
+	modelValue: string | number | null;
 	required?: boolean;
 	readonly?: boolean;
 	disabled?: boolean;