fix: 兼容 Chrome 90 前端运行环境

- 为管理端与用户中心补齐旧浏览器运行时 API 和回归测试

- 增加现代 CSS 与选择器降级，保持现有界面效果

- 固定 Chrome 90 构建目标并补充兼容依赖

easyflow-ui-admin/app/src/views/ai/agents/components/agent-studio/AgentStudioNode.vue

@@ -60,6 +60,7 @@ const iconComponent = computed(() => {
   color: var(--el-text-color-primary);
   text-align: left;
   cursor: pointer;
+  background: var(--el-bg-color);
   background: color-mix(in srgb, var(--el-bg-color) 96%, transparent);
   border: 1px solid var(--el-border-color-lighter);
   border-radius: 16px;
@@ -73,6 +74,7 @@ const iconComponent = computed(() => {
 
 .agent-studio-node:hover {
   background: var(--el-bg-color);
+  border-color: var(--el-color-primary-light-7);
   border-color: color-mix(
     in srgb,
     var(--el-color-primary) 26%,
@@ -88,11 +90,13 @@ const iconComponent = computed(() => {
 }
 
 .agent-studio-node.is-selected {
+  background: var(--el-color-primary-light-9);
   background: color-mix(
     in srgb,
     var(--el-color-primary-light-9) 54%,
     var(--el-bg-color)
   );
+  border-color: var(--el-color-primary-light-5);
   border-color: color-mix(
     in srgb,
     var(--el-color-primary) 42%,
@@ -132,6 +136,7 @@ const iconComponent = computed(() => {
   width: 50px;
   height: 50px;
   font-size: 28px;
+  background: var(--el-color-primary-light-8);
   background: color-mix(
     in srgb,
     var(--el-color-primary-light-8) 74%,
@@ -174,6 +179,7 @@ const iconComponent = computed(() => {
   font-size: 11px;
   line-height: 16px;
   color: var(--el-color-primary);
+  background: var(--el-color-primary-light-9);
   background: color-mix(
     in srgb,
     var(--el-color-primary-light-9) 74%,
@@ -193,4 +199,14 @@ const iconComponent = computed(() => {
   color: var(--el-text-color-regular);
   -webkit-box-orient: vertical;
 }
+
+@supports not (color: color-mix(in srgb, red, blue)) {
+  .agent-studio-node:hover {
+    border-color: var(--el-color-primary-light-7);
+  }
+
+  .agent-studio-node.is-selected {
+    border-color: var(--el-color-primary-light-5);
+  }
+}
 </style>