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/Navigation/NavigationCoordinator.swift

@@ -68,6 +68,7 @@ final class NavigationCoordinator {
             if !isPlayerExpanded {
                 hasAppliedPanelDefaultVisibility = false
                 isCornerLayoutActive = false
+                isWideScreenLayoutActive = false
             }
         }
     }
@@ -82,6 +83,11 @@ final class NavigationCoordinator {
     /// different view than the layout resolver.
     var isCornerLayoutActive = false
 
+    /// Whether the expanded player currently resolves to the widescreen
+    /// (landscape) layout. Set from the sheet's layout pass so non-view code
+    /// (remote control state) reads the real layout instead of screen bounds.
+    var isWideScreenLayoutActive = false
+
     /// Whether the mini player queue sheet is showing.
     var isMiniPlayerQueueSheetPresented = false