chore(admin-ui): reuse filters-card on plans index

tests/Feature/AdminPlansIndexShouldUseFiltersCardClassesTest.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlansIndexShouldUseFiltersCardClassesTest 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_plans_index_should_use_filters_card_classes(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $response = $this->get('/admin/plans');
+        $response->assertOk();
+
+        // 护栏：套餐管理筛选区应复用统一 Filters Card 组件类（与平台订单/订阅列表一致）。
+        $response->assertSee('filters-card', false);
+        $response->assertSee('filters-summary', false);
+        $response->assertSee('filters-body', false);
+        $response->assertSee('filters-grid', false);
+    }
+}