Keep macOS player fullscreen when queue advances to different-aspect video

Aspect-driven window sizing (contentAspectRatio + setFrame) ran even while
the separate player window was in native fullscreen, making AppKit fit and
center the content inside the fullscreen space with black bars around it.

Defer the aspect lock and auto-resize while fullscreen by parking the ratio,
then replay it in windowDidExitFullScreen so the window is ratio-locked (and
auto-fitted when that setting is on) once back in windowed mode.

Yattee/Views/Player/ExpandedPlayerWindowManager.swift

@@ -50,6 +50,16 @@ final class ExpandedPlayerWindowManager: NSObject {
     /// different-aspect video while the window stays open) animate normally.
     private var hasCompletedInitialSizing = false
 
+    /// Aspect ratio received while the window was in native fullscreen. Applying
+    /// `contentAspectRatio`/`setFrame` to a fullscreen window makes AppKit fit and
+    /// center the content inside the fullscreen space (black bars), so the ratio
+    /// is parked here and replayed in `windowDidExitFullScreen`.
+    private var pendingFullScreenAspectRatio: Double?
+
+    private var isPlayerWindowFullScreen: Bool {
+        playerWindow?.styleMask.contains(.fullScreen) ?? false
+    }
+
     // Configuration
     private static let minWidth: CGFloat = 640
     private static let minHeight: CGFloat = 360
@@ -203,6 +213,7 @@ final class ExpandedPlayerWindowManager: NSObject {
         // Fresh window: the next resize is the initial sizing and must snap
         // (no animation) so the player appears at its final fixed layout.
         hasCompletedInitialSizing = false
+        pendingFullScreenAspectRatio = nil
 
         // Show window
         if animated {
@@ -514,6 +525,18 @@ final class ExpandedPlayerWindowManager: NSObject {
         guard let window = playerWindow else { return }
         guard aspectRatio > 0 else { return }
 
+        // In native fullscreen the video must keep the whole screen; constraining
+        // or reframing the window here would letterbox the content inside the
+        // fullscreen space. Park the ratio and replay it on fullscreen exit.
+        if isPlayerWindowFullScreen {
+            pendingFullScreenAspectRatio = aspectRatio
+            LoggingService.shared.debug(
+                "resizeToFitAspectRatio deferred while fullscreen aspect=\(aspectRatio)",
+                category: .player
+            )
+            return
+        }
+
         // Always update the aspect-ratio lock, even if we end up not resizing here.
         Self.applyAspectRatioConstraint(aspectRatio, to: window)
 
@@ -558,6 +581,10 @@ final class ExpandedPlayerWindowManager: NSObject {
     func lockAspectRatio(_ aspectRatio: Double) {
         guard let window = playerWindow else { return }
         guard aspectRatio > 0 else { return }
+        if isPlayerWindowFullScreen {
+            pendingFullScreenAspectRatio = aspectRatio
+            return
+        }
         Self.applyAspectRatioConstraint(aspectRatio, to: window)
     }
 
@@ -779,6 +806,18 @@ extension ExpandedPlayerWindowManager: NSWindowDelegate {
             // dropped so the window could enter primary fullscreen.
             let floating = appEnvironment?.settingsManager.macPlayerFloating ?? false
             configureWindowLevel(window, floating: floating)
+
+            // Replay the aspect ratio that arrived while fullscreen (queue
+            // advanced to a different-aspect video): restore the manual-resize
+            // ratio lock, and auto-fit the window if that setting is on —
+            // exactly what the aspect-change handler would have done windowed.
+            if let ratio = pendingFullScreenAspectRatio {
+                pendingFullScreenAspectRatio = nil
+                Self.applyAspectRatioConstraint(ratio, to: window)
+                if appEnvironment?.settingsManager.playerSheetAutoResize == true {
+                    resizeToFitAspectRatio(ratio, animated: false)
+                }
+            }
         }
     }
 }