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/widgets/WidgetNotifications.vue

@@ -17,9 +17,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { defineAsyncComponent } from 'vue';
+import type { notificationTypes as notificationTypes_typeReferenceOnly } from '@@/js/const.js';
 import { useWidgetPropsManager } from './widget.js';
 import type { WidgetComponentEmits, WidgetComponentExpose, WidgetComponentProps } from './widget.js';
-import type { GetFormResultType } from '@/utility/form.js';
+import type { FormWithDefault, GetFormResultType } from '@/utility/form.js';
 import MkContainer from '@/components/MkContainer.vue';
 import MkStreamingNotificationsTimeline from '@/components/MkStreamingNotificationsTimeline.vue';
 import * as os from '@/os.js';
@@ -29,19 +30,19 @@ const name = 'notifications';
 
 const widgetPropsDef = {
 	showHeader: {
-		type: 'boolean' as const,
+		type: 'boolean',
 		default: true,
 	},
 	height: {
-		type: 'number' as const,
+		type: 'number',
 		default: 300,
 	},
 	excludeTypes: {
-		type: 'array' as const,
+		type: 'array',
 		hidden: true,
-		default: [],
+		default: [] as (typeof notificationTypes_typeReferenceOnly[number])[],
 	},
-};
+} satisfies FormWithDefault;
 
 type WidgetProps = GetFormResultType<typeof widgetPropsDef>;