Update PitchControl styles and refactor StepButton and SequencerTrack components

Commit notes

- Adjust the font size and line height in the PitchControl component for improved readability. - Remove unnecessary props from the StepButton component's PitchControl usage to streamline the code. - Modify the layout of the SequencerTrack component to enhance responsiveness and visual structure.

These changes improve the user interface and maintainability of the components.