refactor: DCM - const border radius, constructor & switch expressions (#19515)

* enable border radius, switch exp, const constructor

* regenerate provider

* more formatting

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

mobile/lib/presentation/widgets/images/remote_thumb_provider.dart

@@ -15,7 +15,7 @@ class RemoteThumbProvider extends ImageProvider<RemoteThumbProvider> {
   final double width;
   final CacheManager? cacheManager;
 
-  RemoteThumbProvider({
+  const RemoteThumbProvider({
     required this.assetId,
     this.height = kTimelineFixedTileExtent,
     this.width = kTimelineFixedTileExtent,

mobile/lib/presentation/widgets/images/thumb_hash_provider.dart

@@ -8,7 +8,7 @@ import 'package:thumbhash/thumbhash.dart';
 class ThumbHashProvider extends ImageProvider<ThumbHashProvider> {
   final String thumbHash;
 
-  ThumbHashProvider({
+  const ThumbHashProvider({
     required this.thumbHash,
   });