style(flowEditor): 优化节点样式和布局

- 为节点添加阴影效果，提升立体感
- 将节点连接点背景色改为蓝色，增加视觉区分度

src/pages/flowEditor/components/nodeContent.tsx

@@ -23,7 +23,7 @@ const renderSpecialNodeHandles = (isStartNode: boolean, isEndNode: boolean, inpu
         position={isStartNode ? Position.Right : Position.Left}
         id={isStartNode ? 'start-source' : 'end-target'}
         style={{
-          background: '#555',
+          background: '#2290f6',
           top: '40px'
         }}
       />
@@ -67,7 +67,7 @@ const renderRegularNodeHandles = (inputs: any[], outputs: any[]) => {
         position={Position.Right}
         id="start-source"
         style={{
-          background: '#555',
+          background: '#2290f6',
           top: '40px'
         }}
       />
@@ -76,7 +76,7 @@ const renderRegularNodeHandles = (inputs: any[], outputs: any[]) => {
         position={Position.Left}
         id="end-target"
         style={{
-          background: '#555',
+          background: '#2290f6',
           top: '40px'
         }}
       />

src/pages/flowEditor/node/style/base.module.less

@@ -4,6 +4,7 @@
   color: white;
   min-width: 150px;
   font-size: 14px;
+  box-shadow: 0px 5px 15px #ccc;
 
   .node-header {
     padding: 5px 15px;