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/Views/Player/ExpandedPlayerSheet.swift

@@ -367,6 +367,9 @@ struct ExpandedPlayerSheet: View {
                 navigationCoordinator?.isCornerLayoutActive = newValue
             }
             #endif
+            .onChange(of: wideScreen, initial: true) { _, newValue in
+                navigationCoordinator?.isWideScreenLayoutActive = newValue
+            }
             .onChange(of: wideScreen) { _, newValue in
                 isInWideScreenLayout = newValue
                 #if os(iOS)