refactor(frontend): Formまわりの型強化 (#16260)

* refactor(frontend): Formまわりの型強化

* fix

* avoid non-null assertion and add null check for safety

* refactor

* avoid non-null assertion and add null check for safety

* Update clip.vue

---------

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

packages/frontend/src/utility/get-note-menu.ts

@@ -101,7 +101,7 @@ export async function getNoteClipMenu(props: {
 			const { canceled, result } = await os.form(i18n.ts.createNewClip, {
 				name: {
 					type: 'string',
-					default: null,
+					default: null as string | null,
 					label: i18n.ts.name,
 				},
 				description: {