Auto-fix JSON comments and trailing commas for HTTP request bodies

Add a per-request "Automatically Fix JSON" toggle (default: on) that strips
comments and trailing commas before sending HTTP requests. When disabled,
comments are sent as-is and the editor linter flags them as errors.

- New JsonBodyEditor component with settings dropdown and dismissible banner
- Configurable JSON linter (allowComments/allowTrailingCommas) via lintExtension prop
- strip_trailing_commas pass in Rust strip_json_comments pipeline
- Fix JSON formatter pulling standalone comments onto previous comma line
- Add get_bool_map helper, maybe_strip_json_comments, and related tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src-web/components/graphql/GraphQLEditor.tsx

@@ -156,6 +156,7 @@ function GraphQLEditorInner({ request, onChange, baseRequest, ...extraEditorProp
                 { type: 'separator', label: 'Setting' },
                 {
                   label: 'Automatic Introspection',
+                  keepOpenOnSelect: true,
                   onSelect: () => {
                     setAutoIntrospectDisabled({
                       ...autoIntrospectDisabled,