- Introduce `drawHighlightedStartButton` method for dynamic rendering of the start button with step indicators.
- Add new constants for `IMAGE_BUTTON_HIGHLIGHTED_GREEN`, `IMAGE_BUTTON_HIGHLIGHTED_GREY`, and `IMAGE_BUTTON_HIGHLIGHTED_COMPLETED`.
- Refactor `getHighlightedAssetName` to provide conditional asset selection based on step completion.
- Implement `drawStepThumb` for rendering step indicators on the washing thumb.
- Adjust highlighted button logic to dynamically incorporate step counts and completion states.
- Add new assets for highlighted button states (`completed`, `green`, `grey`).