chore: Minor design tweaks

lib/components/avatar.dart

@@ -39,7 +39,9 @@ class Avatar extends StatelessWidget {
       child: Text(
         fallbackLetters,
         style: TextStyle(
-          color: Colors.white,
+          color: Theme.of(context).brightness == Brightness.light
+              ? name?.darkColor
+              : name?.lightColor ?? Colors.white,
           fontSize: 18,
         ),
       ),
@@ -55,7 +57,9 @@ class Avatar extends StatelessWidget {
           width: size,
           height: size,
           color: noPic
-              ? name?.lightColor ?? Theme.of(context).secondaryHeaderColor
+              ? Theme.of(context).brightness == Brightness.light
+                  ? name?.lightColor
+                  : name?.darkColor ?? Theme.of(context).secondaryHeaderColor
               : Theme.of(context).secondaryHeaderColor,
           child: noPic
               ? textWidget

lib/utils/string_color.dart

@@ -10,12 +10,21 @@ extension StringColor on String {
     return HSLColor.fromAHSL(1, number, 1, 0.35).toColor();
   }
 
+  Color get darkColor {
+    var number = 0.0;
+    for (var i = 0; i < length; i++) {
+      number += codeUnitAt(i);
+    }
+    number = (number % 10) * 25.5;
+    return HSLColor.fromAHSL(1, number, 1, 0.2).toColor();
+  }
+
   Color get lightColor {
     var number = 0.0;
     for (var i = 0; i < length; i++) {
       number += codeUnitAt(i);
     }
     number = (number % 10) * 25.5;
-    return HSLColor.fromAHSL(1, number, 1, 0.66).toColor();
+    return HSLColor.fromAHSL(1, number, 1, 0.8).toColor();
   }
 }

lib/views/chat_list.dart

@@ -248,6 +248,7 @@ class _ChatListState extends State<ChatList> {
                           searchController: searchController,
                           hintText: L10n.of(context).searchForAChat,
                           onChanged: (_) => setState(() => null),
+                          suffix: Icon(Icons.search_outlined),
                         ),
             ),
             floatingActionButton: