refactor(js): 复制失败toast文案收敛为toastCopyFailed并更新护栏

tests/Feature/AdminJsToastCopyFailedHelperShouldExistTest.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminJsToastCopyFailedHelperShouldExistTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_admin_js_should_include_toast_copy_failed_helper(): void
+    {
+        $js = file_get_contents(public_path('js/admin.js'));
+        $this->assertIsString($js);
+
+        $this->assertStringContainsString('function toastCopyFailed', $js);
+        $this->assertStringContainsString("msg = '复制失败'", $js);
+        $this->assertStringContainsString("return toastError(msg)", $js);
+    }
+}