feat(mobile): custom video player controls (#2960)

* Remove toggle fullscreen button

* Implement custom video player controls

* Move Padding into Container

mobile/lib/modules/asset_viewer/ui/center_play_button.dart

@@ -0,0 +1,53 @@
+import 'package:flutter/material.dart';
+import 'package:immich_mobile/modules/asset_viewer/ui/animated_play_pause.dart';
+
+class CenterPlayButton extends StatelessWidget {
+  const CenterPlayButton({
+    Key? key,
+    required this.backgroundColor,
+    this.iconColor,
+    required this.show,
+    required this.isPlaying,
+    required this.isFinished,
+    this.onPressed,
+  }) : super(key: key);
+
+  final Color backgroundColor;
+  final Color? iconColor;
+  final bool show;
+  final bool isPlaying;
+  final bool isFinished;
+  final VoidCallback? onPressed;
+
+  @override
+  Widget build(BuildContext context) {
+    return ColoredBox(
+      color: Colors.transparent,
+      child: Center(
+        child: UnconstrainedBox(
+          child: AnimatedOpacity(
+            opacity: show ? 1.0 : 0.0,
+            duration: const Duration(milliseconds: 100),
+            child: DecoratedBox(
+              decoration: BoxDecoration(
+                color: backgroundColor,
+                shape: BoxShape.circle,
+              ),
+              child: IconButton(
+                iconSize: 32,
+                padding: const EdgeInsets.all(12.0),
+                icon: isFinished
+                    ? Icon(Icons.replay, color: iconColor)
+                    : AnimatedPlayPause(
+                        color: iconColor,
+                        playing: isPlaying,
+                      ),
+                onPressed: onPressed,
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}