ui(plans): disable-on-submit for plan create/edit form

tests/Feature/AdminPlanFormShouldDisableOnSubmitTest.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlanFormShouldDisableOnSubmitTest 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_plan_create_form_should_disable_on_submit(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $res = $this->get('/admin/plans/create');
+        $res->assertOk();
+
+        $html = (string) $res->getContent();
+
+        $this->assertStringContainsString('data-action="disable-on-submit"', $html);
+        $this->assertStringContainsString('保存套餐', $html);
+    }
+}