fix(tree): 展开箭头和节点图标加 flexShrink:0，防止长label挤压到0宽

bricks/header.tmpl

@@ -37,7 +37,7 @@
   <script type="module"
     src="{{entire_url('/bricks/3parties/model-viewer.min.js')}}">
   </script>
-  <script src="{{entire_url('/bricks/bricks.js')}}?v=20260818a"></script>
+  <script src="{{entire_url('/bricks/bricks.js')}}?v=20260819a"></script>
 {% for myjs in jsfiles() %}
   <script src="{{entire_url(myjs)}}"></script>
 {% endfor %}

bricks/tree.js

@@ -101,6 +101,7 @@ bricks.TreeNode = class extends bricks.VBox {
 				}
 			],
 			rate: 1,
+			flexShrink: 0,
 		});
 	}
 	change_node_type(){
@@ -133,7 +134,8 @@ bricks.TreeNode = class extends bricks.VBox {
 		}
 		this.icon_w = new bricks.Svg({
 			rate:1,
-			url:icon_url
+			url:icon_url,
+			flexShrink: 0,
 		});
 		widget.add_widget(this.icon_w);
 		if (this.tree.node_view){