fix(admin-dashboard): make KPI cards equal height

tests/Feature/AdminDashboardKpiCardsShouldBeEqualHeightByCssGuardTest.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminDashboardKpiCardsShouldBeEqualHeightByCssGuardTest 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_kpi_grid_should_enable_equal_height_cards_via_css(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $res = $this->get('/admin');
+        $res->assertOk();
+
+        // 结构护栏：KPI 区必须存在
+        $res->assertSee('data-role="kpi-grid"', false);
+
+        $css = (string) file_get_contents(public_path('css/admin-components.css'));
+
+        // 护栏：kpi-grid 应显式 stretch，且卡片应为 flex column（保证等高和脚注沉底）
+        $this->assertStringContainsString('.kpi-grid{', $css);
+        $this->assertStringContainsString('align-items:stretch', $css);
+        $this->assertStringContainsString('.kpi-grid .card', $css);
+        $this->assertStringContainsString('display:flex', $css);
+        $this->assertStringContainsString('flex-direction:column', $css);
+        $this->assertStringContainsString('.kpi-grid .stat-card-footnote', $css);
+        $this->assertStringContainsString('margin-top:auto', $css);
+    }
+}