This PR adds a button to close the panel when it is docked to the bottom. Effectively, the button triggers the same `ToggleBottomDock` action that clicking on the button that opened the panel triggers, but I think having it there just makes it extra obvious how to close it, which is beneficial. As a bonus, also fixed the panel controls container height when it is docked to the sides, so it perfectly aligns with the panel tabbar height. | Perfectly Aligned Header | Close Button | |--------|--------| | <img width="2620" height="2010" alt="Screenshot 2025-11-24 at 12 01 2@2x" src="https://github.com/user-attachments/assets/08a50858-1b50-4ebd-af7a-c5dae32cf4f6" /> | <img width="2620" height="2010" alt="Screenshot 2025-11-24 at 12 01@2x" src="https://github.com/user-attachments/assets/17a6eee0-9934-4949-8741-fffd5b106e95" /> | Release Notes: - N/A