ghostty#5000 changed the window level from `.popupMenu` to `.floating`
to improve IME support. However, this introduced a side effect which
render the Quick Terminal (QT) below the macOS menu bar, whereas
previously it would cover it.
When positioned on `right` and `left`, the top of the QT becomes
partially hidden. This PR adjust the size of the QT to ensure it remains
fully visible and stays below the menu bar.