hide status and tab bars on shake (#10950)

Apparently SwiftUI examples support handy shake-to-hide-nav-bar, this is
quite useful for screenshots(e.g. for docs). This expands it to
shake-to-fullscreen, that hides nav, tab and status bars.

GitOrigin-RevId: 0ca735c426d164186b9faee2d5e94afa547c44c4

Author: evil159

Sources/Examples/SwiftUI Examples/Testing Examples/SwiftUIRoot.swift

@@ -142,6 +142,8 @@ struct ExampleView<Content>: View where Content: View {
         content
             .navigationBarTitleDisplayMode(.inline)
             .navigationBarHidden(isNavigationBarHidden)
+            .toolbar(isNavigationBarHidden ? .hidden : .automatic, for: .tabBar)
+            .statusBarHidden(isNavigationBarHidden)
             .onShake {
                 isNavigationBarHidden.toggle()
             }