GlassTabBarTrailingButton class

The plain action button in GlassTabBar.minimizable's trailing slot — the circular glass pill the searchable placement uses for search, carrying an ordinary tap action instead. The generalized form of SwiftUI's Tab(role: .search) trailing circle.

Not to be confused with GlassTabBarExtraButton, which is an additional button rendered beside the pills. This one is the trailing pill: it shares the bar's glass blend layer, morphs with the same springs, and shrinks to GlassTabBar.minimizable's minimizedBarHeight alongside the minimized tab circle. Like its native counterpart it is present in both states; pass it conditionally (see GlassTabBar.minimizable) for app-defined policies such as a button that exists only while minimized.