feature request: audio level control in timeline

Amazing editor 👏 👏 

The feature I'm requesting is similar to iMovie

<img width="820" height="306" alt="Image" src="https://github.com/user-attachments/assets/f9a93afc-3ce0-48d7-88fb-994c55f29e41" />

And fade-in ability, as well 🙏 