chore: Design follow up

lib/pages/chat/events/message.dart

@@ -513,7 +513,8 @@ class Message extends StatelessWidget {
             Row(
               children: [
                 Expanded(
-                  child: Divider(color: theme.colorScheme.secondary),
+                  child:
+                      Divider(color: theme.colorScheme.surfaceContainerHighest),
                 ),
                 Container(
                   margin: const EdgeInsets.symmetric(
@@ -522,18 +523,24 @@ class Message extends StatelessWidget {
                   ),
                   padding: const EdgeInsets.symmetric(
                     horizontal: 8,
+                    vertical: 2,
+                  ),
+                  decoration: BoxDecoration(
+                    borderRadius:
+                        BorderRadius.circular(AppConfig.borderRadius / 3),
+                    color: theme.colorScheme.surface.withAlpha(128),
                   ),
                   child: Text(
                     L10n.of(context).readUpToHere,
                     style: TextStyle(
-                      fontWeight: FontWeight.bold,
                       fontSize: 12 * AppConfig.fontSizeFactor,
                       color: theme.colorScheme.secondary,
                     ),
                   ),
                 ),
                 Expanded(
-                  child: Divider(color: theme.colorScheme.secondary),
+                  child:
+                      Divider(color: theme.colorScheme.surfaceContainerHighest),
                 ),
               ],
             ),