deps(mobile): flutter 3.16 (#6677)

* dep(mobile): update flutter and deps

* chore: dart analyzer

* chore: update flutter workflow version

* chore: dart format

* fix: gallery_viewer PopScope

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

mobile/lib/modules/asset_viewer/views/gallery_viewer.dart

@@ -751,15 +751,16 @@ class GalleryViewerPage extends HookConsumerWidget {
       }
     });
 
-    return Scaffold(
-      backgroundColor: Colors.black,
-      body: WillPopScope(
-        onWillPop: () async {
-          // Change immersive mode back to normal "edgeToEdge" mode
-          await SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
-          return true;
-        },
-        child: Stack(
+    return PopScope(
+      canPop: false,
+      onPopInvoked: (_) {
+        // Change immersive mode back to normal "edgeToEdge" mode
+        SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
+        context.pop();
+      },
+      child: Scaffold(
+        backgroundColor: Colors.black,
+        body: Stack(
           children: [
             PhotoViewGallery.builder(
               scaleStateChangedCallback: (state) {

mobile/lib/modules/asset_viewer/views/video_viewer_page.dart

@@ -26,14 +26,14 @@ class VideoViewerPage extends HookConsumerWidget {
   final VoidCallback? onPaused;
 
   const VideoViewerPage({
-    Key? key,
+    super.key,
     required this.asset,
     required this.isMotionVideo,
     required this.onVideoEnded,
     this.onPlaying,
     this.onPaused,
     this.placeholder,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
@@ -112,7 +112,7 @@ class VideoPlayer extends StatefulWidget {
   final Widget? placeholder;
 
   const VideoPlayer({
-    Key? key,
+    super.key,
     this.url,
     this.jwtToken,
     this.file,
@@ -121,7 +121,7 @@ class VideoPlayer extends StatefulWidget {
     this.onPlaying,
     this.onPaused,
     this.placeholder,
-  }) : super(key: key);
+  });
 
   @override
   State<VideoPlayer> createState() => _VideoPlayerState();