feat(admin): 管理端 UI/UX 深度优化——错误/加载/空状态、表单快捷键、移动端适配与无障碍

apps/admin/src/index.css

@@ -514,3 +514,68 @@ canvas {
     padding-inline: 0;
   }
 }
+
+/* ─── 全局无障碍与质感增强 ─── */
+html {
+  scroll-behavior: smooth;
+}
+
+::selection {
+  background: rgba(0, 122, 255, 0.18);
+}
+
+/* 键盘导航焦点可见（鼠标点击不显示，符合 WCAG 2.4.7） */
+:focus-visible {
+  outline: 2px solid #007aff;
+  outline-offset: 2px;
+}
+
+/* 细滚动条（macOS/Chromium），降低大面积滚动条对视觉的干扰 */
+::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+::-webkit-scrollbar-thumb {
+  background: rgba(0, 0, 0, 0.16);
+  border: 2px solid transparent;
+  border-radius: 8px;
+  background-clip: content-box;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background-color: rgba(0, 0, 0, 0.28);
+}
+
+/* 尊重系统「减少动态效果」偏好 */
+/* 窄屏下压缩路由标签尺寸，避免横向裁切 */
+@media (max-width: 575px) {
+  .route-dock {
+    padding: 6px 8px;
+  }
+
+  .route-dock .ant-tabs-tab {
+    min-width: 88px;
+    max-width: 160px;
+    padding: 0 8px 0 10px !important;
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  html {
+    scroll-behavior: auto;
+  }
+
+  *,
+  *::before,
+  *::after {
+    animation-duration: 0.01ms !important;
+    animation-iteration-count: 1 !important;
+    transition-duration: 0.01ms !important;
+    scroll-behavior: auto !important;
+  }
+}