The swipe-action share sheet, the expanded player's safe area and the
Dynamic Island side check took connectedScenes.first, which ignores
which scene is active (on the iPhone Duo it can be the other panel's)
and presented the share sheet from the main window, behind an expanded
player.
UIApplication.foregroundWindowScene/foregroundWindow resolve the
foreground-active scene (else foreground-inactive, else any) and its
key window, the order the widescreen layout already used. The share
sheet now presents from the key window, which is the player's while it
is up. The tvOS display mode manager uses the same lookup.
Lets the Apple TV switch its HDMI output to match the playing video's
frame rate and dynamic range via AVDisplayManager.preferredDisplayCriteria,
driven from MPV's container-fps and video-params/gamma. Two opt-in toggles
(default off) live under Playback → Display on tvOS; both are no-ops on
other platforms. Anchor an AVKit class symbol so the linker keeps AVKit
linked — Swift only autolinks AVFoundation here, and without AVKit the
UIWindow.avDisplayManager category isn't loaded at runtime.
