Player controls: one model, two skins (Standard, Minimal); conventional layout; controls settings

PlayerControlsModel holds the controls' state and actions once; the
Standard skin (our own, no more media_kit controls or private-state
reach-ins) and Minimal (the former uosc design, made the app's own and
credited) only draw it. One layout spec for both: play first, then
previous/next, volume, time; subtitles, audio, settings, chat,
fullscreen last; everything else in the settings menu. Settings ->
Player -> Controls: time display, size, hide delay, optional buttons.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/desktop/lib/src/controls/controls_probe.dart

@@ -6,8 +6,7 @@ import 'package:flutter/material.dart';
 /// mouse on a floating element over the picture (a pill, a card, the
 /// status pill: [ControlsHoldRegion]) or an open popover. While anything
 /// holds, the controls stay up; on release they hide on their usual
-/// countdown. Both designs follow it ([ControlsHoverProbe] with
-/// media_kit's controls, `UoscControls`).
+/// countdown. Both skins follow it (through `ControlsFrame`).
 class ControlsHold extends ChangeNotifier {
   final _by = <Object>{};
   bool _told = false;
@@ -74,109 +73,3 @@ class _ControlsHoldRegionState extends State<ControlsHoldRegion> {
     );
   }
 }
-
-/// Follows whether media_kit's desktop controls around [child] are up,
-/// by the same rule they use: up on mount and on any mouse movement,
-/// down [hideAfter] later or when the mouse leaves. media_kit does not
-/// expose its visibility; this lets the player draw a progress line while
-/// they are down. With [hold] held it keeps them (and itself) up. Never
-/// takes input.
-class ControlsHoverProbe extends StatefulWidget {
-  final ValueNotifier<bool> shown;
-  final Duration hideAfter;
-  final ControlsHold? hold;
-  final Widget child;
-  const ControlsHoverProbe(
-      {super.key, required this.shown, required this.hideAfter, this.hold, required this.child});
-
-  @override
-  State<ControlsHoverProbe> createState() => _ControlsHoverProbeState();
-}
-
-class _ControlsHoverProbeState extends State<ControlsHoverProbe> {
-  Timer? _timer;
-  // While held: media_kit's own countdown is restarted before it ends.
-  Timer? _keep;
-
-  bool get _held => widget.hold?.held ?? false;
-
-  @override
-  void initState() {
-    super.initState();
-    widget.hold?.addListener(_holdChanged);
-    // Not during this build: the line listening to [shown] may be built.
-    WidgetsBinding.instance.addPostFrameCallback((_) {
-      if (mounted) _wake();
-    });
-  }
-
-  @override
-  void didUpdateWidget(ControlsHoverProbe oldWidget) {
-    super.didUpdateWidget(oldWidget);
-    if (oldWidget.hold != widget.hold) {
-      oldWidget.hold?.removeListener(_holdChanged);
-      widget.hold?.addListener(_holdChanged);
-      _holdChanged();
-    }
-  }
-
-  @override
-  void dispose() {
-    widget.hold?.removeListener(_holdChanged);
-    _timer?.cancel();
-    _keep?.cancel();
-    super.dispose();
-  }
-
-  void _holdChanged() {
-    if (!mounted) return;
-    _keep?.cancel();
-    _keep = null;
-    if (_held) {
-      _keep = Timer.periodic(widget.hideAfter * 0.5, (_) => _pokeControls());
-    }
-    _pokeControls();
-    _wake();
-  }
-
-  /// media_kit's controls state is private: a guarded dynamic call to its
-  /// hover handler, as a mouse movement on it would make.
-  void _pokeControls() {
-    if (!mounted) return;
-    void visit(Element e) {
-      if (e is StatefulElement && e.state.runtimeType.toString() == '_MaterialDesktopVideoControlsState') {
-        try {
-          (e.state as dynamic).onHover();
-        } catch (_) {}
-        return;
-      }
-      e.visitChildElements(visit);
-    }
-
-    context.visitChildElements(visit);
-  }
-
-  void _wake() {
-    widget.shown.value = true;
-    _timer?.cancel();
-    _timer = Timer(widget.hideAfter, _hide);
-  }
-
-  void _hide() {
-    _timer?.cancel();
-    if (!mounted || _held) return;
-    widget.shown.value = false;
-  }
-
-  @override
-  Widget build(BuildContext context) => MouseRegion(
-        opaque: false,
-        hitTestBehavior: HitTestBehavior.translucent,
-        onEnter: (_) => _wake(),
-        onHover: (_) => _wake(),
-        // Held (the mouse went onto a pill or the popover): media_kit's
-        // controls just hid on their own exit; bring them straight back.
-        onExit: (_) => _held ? _pokeControls() : _hide(),
-        child: widget.child,
-      );
-}