chore: Follow up design

lib/pages/chat/chat_view.dart

@@ -304,9 +304,7 @@ class ChatView extends StatelessWidget {
                               alignment: Alignment.center,
                               child: Material(
                                 clipBehavior: Clip.hardEdge,
-                                color: accountConfig.wallpaperUrl != null
+                                color: theme.colorScheme.surfaceContainerHigh,
-                                    ? theme.colorScheme.surfaceBright
-                                    : theme.colorScheme.surfaceContainerHigh,
                                 borderRadius: const BorderRadius.all(
                                   Radius.circular(24),
                                 ),

lib/pages/chat/events/message.dart

@@ -84,9 +84,7 @@ class Message extends StatelessWidget {
     final ownMessage = event.senderId == client.userID;
     final alignment = ownMessage ? Alignment.topRight : Alignment.topLeft;
 
-    var color = wallpaperMode
+    var color = theme.colorScheme.surfaceContainerHigh;
-        ? theme.colorScheme.surfaceBright
-        : theme.colorScheme.surfaceContainerHigh;
     final displayTime = event.type == EventTypes.RoomCreate ||
         nextEvent == null ||
         !event.originServerTs.sameEnvironment(nextEvent!.originServerTs);
@@ -270,15 +268,13 @@ class Message extends StatelessWidget {
                                                 shadows: !wallpaperMode
                                                     ? null
                                                     : [
-                                                        Shadow(
+                                                        const Shadow(
-                                                          offset: const Offset(
+                                                          offset: Offset(
                                                             0.0,
                                                             0.0,
                                                           ),
-                                                          blurRadius: 5,
+                                                          blurRadius: 3,
-                                                          color: theme
+                                                          color: Colors.black,
-                                                              .colorScheme
-                                                              .surface,
                                                         ),
                                                       ],
                                               ),

lib/pages/settings_style/settings_style_view.dart

@@ -256,10 +256,8 @@ class SettingsStyleView extends StatelessWidget {
                                     bottom: 12,
                                   ),
                                   child: Material(
-                                    color: accountConfig.wallpaperUrl == null
+                                    color:
-                                        ? theme
+                                        theme.colorScheme.surfaceContainerHigh,
-                                            .colorScheme.surfaceContainerHighest
-                                        : theme.colorScheme.surfaceBright,
                                     borderRadius: BorderRadius.circular(
                                       AppConfig.borderRadius,
                                     ),

lib/widgets/mxc_image.dart

@@ -140,7 +140,7 @@ class _MxcImageState extends State<MxcImage> {
     return AnimatedCrossFade(
       crossFadeState:
           hasData ? CrossFadeState.showSecond : CrossFadeState.showFirst,
-      duration: FluffyThemes.animationDuration,
+      duration: const Duration(milliseconds: 128),
       firstChild: placeholder(context),
       secondChild: hasData
           ? Image.memory(