fix: make stub components proper Angular standalone components

Author: JohannesHoppe

tests/manual/components/book-list.ts

@@ -1,3 +1,8 @@
-export class BookList {
-  title = 'Book List';
-}
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-book-list',
+  standalone: true,
+  template: '<p>Book List</p>',
+})
+export class BookList {}

tests/manual/components/user-detail.ts

@@ -1,3 +1,8 @@
-export class UserDetail {
-  name = 'User Detail';
-}
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-user-detail',
+  standalone: true,
+  template: '<p>User Detail</p>',
+})
+export class UserDetail {}