chore(admin-ui): support tickets placeholder uses page header and list card

tests/Feature/AdminSupportTicketsIndexShouldUsePageHeaderAndListCardTest.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminSupportTicketsIndexShouldUsePageHeaderAndListCardTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_admin_support_tickets_index_should_use_page_header_and_list_card(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $response = $this->get('/admin/support-tickets');
+        $response->assertOk();
+
+        // 护栏：占位页也要走统一的 PageHeader + ListCard 骨架，后续加功能不返工。
+        $response->assertSee('page-header', false);
+        $response->assertSee('page-header-title', false);
+        $response->assertSee('page-header-subtitle', false);
+        $response->assertSee('page-header-actions', false);
+        $response->assertSee('page-header-meta', false);
+
+        $response->assertSee('list-card', false);
+        $response->assertSee('list-card-header', false);
+        $response->assertSee('list-card-body', false);
+        $response->assertSee('list-card-table', false);
+
+        $response->assertSee('table-empty', false);
+    }
+}