refactor(frontend): asとanyをすぐなおせる範囲で除去 (#14848)

* refactor(frontend): できるだけanyを除去

* refactor

* lint

* fix

* remove unused

* Update packages/frontend/src/components/MkReactionsViewer.details.vue

* Update packages/frontend/src/components/MkUsersTooltip.vue

---------

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

packages/frontend/src/pages/admin/users.vue

@@ -99,19 +99,19 @@ async function addUser() {
 	const { canceled: canceled1, result: username } = await os.inputText({
 		title: i18n.ts.username,
 	});
-	if (canceled1) return;
+	if (canceled1 || username == null) return;
 
 	const { canceled: canceled2, result: password } = await os.inputText({
 		title: i18n.ts.password,
 		type: 'password',
 	});
-	if (canceled2) return;
+	if (canceled2 || password == null) return;
 
 	os.apiWithDialog('admin/accounts/create', {
 		username: username,
 		password: password,
 	}).then(res => {
-		paginationComponent.value.reload();
+		paginationComponent.value?.reload();
 	});
 }