Rework tvOS player controls and settings sheet

Replace the tvOS bottom action bar with Settings / Info / Comments /
Next / Close. Settings reuses QualitySelectorView (video, audio,
subtitles, speed); Comments opens TVDetailsPanel directly on the
comments tab; Close stops playback and dismisses.

Debug button is hidden by default and can be re-enabled via a new
tvOS-only Advanced Settings > Developer toggle.

Present the settings sheet as a fullScreenCover with a centered
material card, fix the "Normal" hyphenation, and restyle row selection
throughout the quality selector on tvOS: per-row rounded backgrounds
with focus tint + stroke, vertical spacing instead of dividers, and a
focusable speed-rate menu.

Yattee/Core/SettingsManager.swift

@@ -140,6 +140,7 @@ final class SettingsManager {
     // Advanced settings
     var _showAdvancedStreamDetails: Bool?
     var _showPlayerAreaDebug: Bool?
+    var _showTVDebugButton: Bool?
     var _verboseMPVLogging: Bool?
     var _verboseRemoteControlLogging: Bool?
     var _mpvBufferSeconds: Double?
@@ -465,6 +466,7 @@ final class SettingsManager {
         _sidebarPlaylistsLimitEnabled = nil
         _showAdvancedStreamDetails = nil
         _showPlayerAreaDebug = nil
+        _showTVDebugButton = nil
         _verboseMPVLogging = nil
         _verboseRemoteControlLogging = nil
         _mpvBufferSeconds = nil