Feature：Add a loading status to the agent canvas page. (#11733)

### What problem does this PR solve?

Feature：Add a loading status to the agent canvas page.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/custom.d.ts

@@ -2,3 +2,9 @@ declare module '*.md' {
   const content: string;
   export default content;
 }
+
+declare module 'jsoneditor' {
+  const JSONEditor: any;
+  export default JSONEditor;
+  export = JSONEditor;
+}