Qt AI Assistant version 0.9.4 (#27)

# Qt AI Assistant 0.9.4 Release Notes

## New Features
- **Embedded QML Linter**: Added a second agent for QML linting,
improving code quality checks and developer productivity.
- **Custom LLM Configuration**: Users can now tailor the Language Model
configuration to suit specific needs.
- **Send/Cancel Toggled Button**: Introduced a toggle button to stop
request processing during LLM content streaming, giving users more
control over interactions.

## Improvements
- **LLM Server Configuration Migration**: Migrated the configuration
file from JSON to TOML format, significantly improving readability,
particularly for prompts.

## Removed Features
- **StarCoder Removal**: Removed StarCoder from the LLM portfolio due to
unsatisfactory coding performance.

## Checklist

- [x] I have run `npm run all` to validate my changes
- [x] I have made sure my commits are
[signed](https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits)
- [ ] I have added an entry for new Extensions in
[CODEOWNERS](/CODEOWNERS)

Author: lupax