TypeError: can't access property "renderElement", this.renderer is undefined

## Error

```
can't access property "renderElement", this.renderer is undefined
```

## Stack trace

```
../node_modules/@hotwired/turbo/dist/turbo.es2017-esm.js:1041 in View.render
```

## Tracking Details
- **Project**: exercism-js
- **Sentry**: [TypeError: can't access property "renderElement", this.renderer is undefined](https://thalamus-ai.sentry.io/issues/137209217/)
- **Culprit**: View.render(@hotwired/turbo/dist/turbo.es2017-esm)
- **First seen:** Jul 29, 2026

Start with the Sentry report and the stack trace at ../node_modules/@hotwired/turbo/dist/turbo.es2017-esm.js:1041 in View.render; determine which website interaction leaves this.renderer undefined. Trace that interaction into the website code, reproduce the failure, and add coverage showing that the render path no longer raises this TypeError.

Written by the indexing model from the issue text.