[AUTO-TODO] add onPush change detection strategy

Auto-created issue from TODO comment in `web/src/app/formly/button-type.component.ts` at line 21:

```
// todo: add onPush change detection strategy
```

This issue was automatically generated. To resolve it, either:
1. Implement the requested feature/fix
2. Remove the TODO comment from the code

The issue will be automatically closed when the TODO is removed.