优化渲染节点功能，使用 ref 文件渲染大量节点

src/components/chat/ChatToolCallBlock.tsx

@@ -268,12 +268,7 @@ function getToolDescription(toolCall: ToolCall): string {
       return (params.title as string | undefined) ?? "数据图表";
     }
     case "render_junctions": {
-      const nodeAreaMap =
-        params.node_area_map && typeof params.node_area_map === "object"
-          ? (params.node_area_map as Record<string, unknown>)
-          : {};
-      const areaIds = Array.isArray(params.area_ids) ? params.area_ids : [];
-      return `${Object.keys(nodeAreaMap).length} 个节点 · ${areaIds.length || new Set(Object.values(nodeAreaMap).map(String)).size} 个分区`;
+      return (params.render_ref as string | undefined) ?? "渲染引用";
     }
     default:
       return "";
@@ -398,28 +393,14 @@ function buildAction(toolCall: ToolCall): ChatToolAction | null {
         yAxisName: params.y_axis_name as string | undefined,
       };
     case "render_junctions": {
-      const nodeAreaMap =
-        params.node_area_map && typeof params.node_area_map === "object"
-          ? Object.fromEntries(
-              Object.entries(params.node_area_map as Record<string, unknown>)
-                .map(([key, value]) => [String(key), String(value ?? "")])
-                .filter(([, value]) => value.trim().length > 0),
-            )
-          : {};
+      const renderRef =
+        typeof params.render_ref === "string" ? params.render_ref.trim() : "";
+      if (!renderRef) {
+        return null;
+      }
       return {
         type: "render_junctions",
-        nodeAreaMap,
-        areaIds: Array.isArray(params.area_ids)
-          ? params.area_ids.map((item) => String(item).trim()).filter(Boolean)
-          : [],
-        areaColors:
-          params.area_colors && typeof params.area_colors === "object"
-            ? Object.fromEntries(
-                Object.entries(params.area_colors as Record<string, unknown>)
-                  .map(([key, value]) => [String(key), String(value ?? "")])
-                  .filter(([, value]) => value.trim().length > 0),
-              )
-            : {},
+        renderRef,
       };
     }
     default: