Upgrade Flutter/Dart and dependencies (#265)

* Fix new lint issues

* Upgrade packages and remove `device_preview`

* Regenerate splash assets

* Migrate to `webview_flutter` 4.0

* Upgrade to Flutter 3.10 and Dart 3

* Update Podfile

* Fix video not disposing when leaving channel

* Remove `tuple` package

* Upgrade packages

* Upgrade packages

* Update podfile

* Upgrade packages

* Upgrade packages

lib/screens/channel/video/video.dart

@@ -37,17 +37,8 @@ class _VideoState extends State<Video> with WidgetsBindingObserver {
 
   @override
   Widget build(BuildContext context) {
-    return WebView(
-      backgroundColor: Colors.black,
-      initialUrl: widget.videoStore.videoUrl,
-      javascriptMode: JavascriptMode.unrestricted,
-      allowsInlineMediaPlayback: true,
-      initialMediaPlaybackPolicy: AutoMediaPlaybackPolicy.always_allow,
-      onWebViewCreated: (controller) =>
-          widget.videoStore.controller = controller,
-      onPageFinished: (string) => widget.videoStore.initVideo(),
-      navigationDelegate: widget.videoStore.handleNavigation,
-      javascriptChannels: widget.videoStore.javascriptChannels,
+    return WebViewWidget(
+      controller: widget.videoStore.videoWebViewController,
     );
   }