Taking Control of Toolbar Items in SwiftUI

SwiftUI introduces several new Toolbar APIs giving developers finer control over toolbar item visibility and behavior across platforms. Key additions include the visibilityPriority modifier for ToolbarContent (with automatic, low, and high options), the ToolbarOverflowMenu type for explicitly collapsing groups of items, the topBarPinnedTrailing placement to keep items pinned to the top bar trailing edge, and the toolbarMinimizeBehavior modifier to minimize navigation, tab, bottom, or window bars on scroll. These APIs help balance SwiftUI's adaptive behavior with explicit developer control across iOS, iPadOS, and macOS.