fix: avatar color

lib/pages/chat/events/message.dart

@@ -168,7 +168,7 @@ class Message extends StatelessWidget {
                               color: (Theme.of(context).brightness ==
                                       Brightness.light
                                   ? displayname.color
-                                  : displayname.lightColor),
+                                  : displayname.lightColorText),
                             ),
                           );
                         }),

lib/utils/string_color.dart

@@ -22,8 +22,13 @@ extension StringColor on String {
     return _colorCache[this]![0.2] ??= _getColorLight(0.2);
   }
 
-  Color get lightColor {
+  Color get lightColorText {
     _colorCache[this] ??= {};
     return _colorCache[this]![0.7] ??= _getColorLight(0.7);
   }
+
+  Color get lightColorAvatar {
+    _colorCache[this] ??= {};
+    return _colorCache[this]![0.4] ??= _getColorLight(0.4);
+  }
 }

lib/widgets/avatar.dart

@@ -58,8 +58,9 @@ class Avatar extends StatelessWidget {
         child: Container(
           width: size,
           height: size,
-          color:
-              noPic ? name?.lightColor : Theme.of(context).secondaryHeaderColor,
+          color: noPic
+              ? name?.lightColorAvatar
+              : Theme.of(context).secondaryHeaderColor,
           child: noPic
               ? textWidget
               : MxcImage(