Improve fullscreen orientation handling for iOS player

Refactor orientation logic when entering fullscreen to better handle
button-initiated vs gesture-initiated transitions:

- Consolidate orientation determination into a single expression that
  considers whether fullscreen was initiated by button or gesture
- When initiated by button, always use rotateToLandscapeOnEnterFullScreen
  preference
- When initiated by gesture, respect current device orientation if already
  in landscape, otherwise use preference
- Apply .landscape lock only for button-initiated transitions, .all for
  gesture-initiated (when not orientation locked)

This provides more intuitive behavior where button taps rotate to preferred
orientation, while gestures respect current device orientation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Model/Player/PlayerModel.swift

@@ -1182,19 +1182,16 @@ final class PlayerModel: ObservableObject {
                 }
                 let lockOrientation = rotateToLandscapeOnEnterFullScreen.interfaceOrientation
                 if currentVideoIsLandscape {
-                    if initiatedByButton {
+                    let orientation = initiatedByButton
-                        Orientation.lockOrientation(isOrientationLocked
+                        ? rotateToLandscapeOnEnterFullScreen.interfaceOrientation
-                            ? (lockOrientation == .landscapeRight ? .landscapeRight : .landscapeLeft)
+                        : (OrientationTracker.shared.currentDeviceOrientation.isLandscape
-                            : .landscape)
+                            ? OrientationTracker.shared.currentInterfaceOrientation
-                    }
+                            : rotateToLandscapeOnEnterFullScreen.interfaceOrientation)
-                    let orientation = OrientationTracker.shared.currentDeviceOrientation.isLandscape
-                        ? OrientationTracker.shared.currentInterfaceOrientation
-                        : rotateToLandscapeOnEnterFullScreen.interfaceOrientation
 
                     Orientation.lockOrientation(
                         isOrientationLocked
                             ? (lockOrientation == .landscapeRight ? .landscapeRight : .landscapeLeft)
-                            : .all,
+                            : (initiatedByButton ? .landscape : .all),
                         andRotateTo: orientation
                     )
                 }