fix: validate mcp_tool_id when mcp_source is referencing

Author: liuruibin

ui/src/workflow/nodes/mcp-node/index.vue

@@ -327,6 +327,12 @@ function getTools() {
     MsgError(t('views.applicationWorkflow.nodes.mcpNode.mcpToolTip'))
     return
   }
+  if (form_data.value.mcp_source === 'referencing' && form_data.value.mcp_tool_id) {
+    if (!mcpToolSelectOptions.value.find((item) => item.id === form_data.value.mcp_tool_id)) {
+      MsgError(t('views.applicationWorkflow.nodes.mcpNode.mcpToolTip'))
+      return
+    }
+  }
   if (form_data.value.mcp_source === 'custom' && !form_data.value.mcp_servers) {
     MsgError(t('views.applicationWorkflow.nodes.mcpNode.mcpServerTip'))
     return