chore(admin-ui): unify list table empty state styling and class usage

tests/Feature/AdminComponentsCssListCardTableEmptyStateShouldBeCenteredTest.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminComponentsCssListCardTableEmptyStateShouldBeCenteredTest 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_components_css_list_card_table_empty_state_should_be_centered(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $css = file_get_contents(public_path('css/admin-components.css'));
+        $this->assertIsString($css);
+
+        // 空状态行（table-empty）应统一居中 + 留白，避免每页空态体验不一致。
+        $this->assertStringContainsString('.list-card-table .table-empty{', $css);
+        $this->assertStringContainsString('text-align:center', $css);
+        $this->assertStringContainsString('padding:24px 12px', $css);
+    }
+}