Support comments in JSON body (#419)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src-web/components/core/Editor/json-lint.ts

@@ -4,14 +4,22 @@ import { parse as jsonLintParse } from '@prantlf/jsonlint';
 
 const TEMPLATE_SYNTAX_REGEX = /\$\{\[[\s\S]*?]}/g;
 
-export function jsonParseLinter() {
+interface JsonLintOptions {
+  allowComments?: boolean;
+  allowTrailingCommas?: boolean;
+}
+
+export function jsonParseLinter(options?: JsonLintOptions) {
   return (view: EditorView): Diagnostic[] => {
     try {
       const doc = view.state.doc.toString();
       // We need lint to not break on stuff like {"foo:" ${[ ... ]}} so we'll replace all template
       // syntax with repeating `1` characters, so it's valid JSON and the position is still correct.
       const escapedDoc = doc.replace(TEMPLATE_SYNTAX_REGEX, (m) => '1'.repeat(m.length));
-      jsonLintParse(escapedDoc);
+      jsonLintParse(escapedDoc, {
+        mode: (options?.allowComments ?? true) ? 'cjson' : 'json',
+        ignoreTrailingCommas: options?.allowTrailingCommas ?? false,
+      });
       // biome-ignore lint/suspicious/noExplicitAny: none
     } catch (err: any) {
       if (!('location' in err)) {