OperationError: The operation failed for an operation-specific reason

## Error

```
The operation failed for an operation-specific reason
```

## Stack trace

```
../app/javascript/components/editor/header/Settings.tsx:98 in Settings
../app/javascript/components/Editor.tsx:88 in Editor_default
../node_modules/@sentry/react/src/errorboundary.tsx:101 in new ErrorBoundary
../node_modules/@tanstack/react-query/src/QueryClientProvider.tsx:29 in QueryClientProvider
```

## Tracking Details
- **Project**: exercism-js
- **Sentry**: [OperationError: The operation failed for an operation-specific reason](https://thalamus-ai.sentry.io/issues/143420479/)
- **Culprit**: id(app/javascript/components/dropdowns/useDropdown)
- **First seen:** Aug 28, 2026

Start by reading app/javascript/components/editor/header/Settings.tsx at line 98 and trace the call through app/javascript/components/Editor.tsx. Then inspect the app/javascript/components/dropdowns/useDropdown entry named as the Sentry culprit and use the linked Sentry event for context. Done means the reported OperationError no longer occurs in the affected editor flow.

Written by the indexing model from the issue text.