Replace UIScreen.main with scene-local context

- List row hairlines read displayScale from the SwiftUI environment
- MPV render views take contentScaleFactor from traitCollection and
  re-apply it on UITraitDisplayScale changes
- ExpandedPlayerWindow scales against the presenting view's own height
- MPVPiPBridge sizes the PiP layer from the container view's window
  scene screen (UIScreen.main kept only as a nil-window fallback)
- WideScreenPlayerLayout falls back to the offered geometry size
- Remote control fullscreen state comes from the player sheet's layout
  pass via NavigationCoordinator.isWideScreenLayoutActive instead of
  screen bounds aspect
- Orientation TODOs for Dynamic Island side detection and
  prefersInterfaceOrientationLocked

Yattee/Services/RemoteControl/RemoteControlCoordinator.swift

@@ -480,8 +480,7 @@ final class RemoteControlCoordinator {
         // Compute fullscreen state (same logic as shouldShowFullscreenButton in PlayerControlsActions)
         #if os(iOS)
         let isIPad = UIDevice.current.userInterfaceIdiom == .pad
-        let screenBounds = UIScreen.main.bounds
-        let isWideScreenLayout = screenBounds.width > screenBounds.height
+        let isWideScreenLayout = navigationCoordinator?.isWideScreenLayoutActive ?? false
         // iPad in widescreen = can't force rotation, so fullscreen toggle not available
         let canToggleFullscreen = !(isIPad && isWideScreenLayout) && state.currentVideo != nil
         let isFullscreen = isWideScreenLayout