chore: Slightly update chat colors

lib/pages/chat/chat_view.dart

@@ -308,10 +308,7 @@ class ChatView extends StatelessWidget {
                               alignment: Alignment.center,
                               child: Material(
                                 clipBehavior: Clip.hardEdge,
-                                color: theme
+                                color: theme.colorScheme.surfaceContainerHigh,
-                                    .colorScheme
-                                    // ignore: deprecated_member_use
-                                    .surfaceVariant,
                                 borderRadius: const BorderRadius.all(
                                   Radius.circular(24),
                                 ),

lib/pages/chat/events/message.dart

@@ -83,8 +83,8 @@ class Message extends StatelessWidget {
     final client = Matrix.of(context).client;
     final ownMessage = event.senderId == client.userID;
     final alignment = ownMessage ? Alignment.topRight : Alignment.topLeft;
-    // ignore: deprecated_member_use
+
-    var color = theme.colorScheme.surfaceVariant;
+    var color = theme.colorScheme.surfaceContainerHigh;
     final displayTime = event.type == EventTypes.RoomCreate ||
         nextEvent == null ||
         !event.originServerTs.sameEnvironment(nextEvent!.originServerTs);

lib/pages/chat/typing_indicators.dart

@@ -81,9 +81,7 @@ class TypingIndicators extends StatelessWidget {
                 ),
                 const SizedBox(width: 8),
                 Material(
-                  color:
+                  color: theme.colorScheme.surfaceContainerHigh,
-                      // ignore: deprecated_member_use
-                      theme.colorScheme.surfaceVariant,
                   borderRadius: const BorderRadius.all(
                     Radius.circular(AppConfig.borderRadius),
                   ),

lib/pages/user_bottom_sheet/user_bottom_sheet_view.dart

@@ -69,9 +69,7 @@ class UserBottomSheetView extends StatelessWidget {
                   Padding(
                     padding: const EdgeInsets.all(12.0),
                     child: Material(
-                      color:
+                      color: theme.colorScheme.surfaceContainerHigh,
-                          // ignore: deprecated_member_use
-                          theme.colorScheme.surfaceVariant,
                       borderRadius:
                           BorderRadius.circular(AppConfig.borderRadius),
                       child: ListTile(