OperationError: The operation failed for an operation-specific reason

## Error

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

## Stack trace

```
../app/javascript/components/student/iterations-list/OptionsDropdown.tsx:10 in OptionsDropdown
../app/javascript/components/student/iterations-list/Information.tsx:22 in Information
../app/javascript/components/student/iterations-list/IterationReport.tsx:14 in IterationReport
../app/javascript/components/student/IterationsList.tsx:61 in IterationsList
../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/134001033/)
- **Culprit**: id(app/javascript/components/dropdowns/useDropdown)
- **First seen:** Jul 13, 2026

Start with app/javascript/components/student/iterations-list/OptionsDropdown.tsx and trace the useDropdown call identified as the Sentry culprit. Follow the stack through Information.tsx, IterationReport.tsx, and IterationsList.tsx, then reproduce the exercism-js error and verify that the operation completes without the reported OperationError.

Written by the indexing model from the issue text.