fix: 欢迎卡片图标去白圆点 + 按钮渐变图标 + 多处微调

health_app/lib/pages/home/widgets/chat_messages_view.dart

@@ -408,7 +408,10 @@ class ChatMessagesView extends ConsumerWidget {
           child: Row(
             mainAxisSize: MainAxisSize.min,
             children: [
-              Icon(a.icon, size: 24, color: AppColors.textPrimary),
+              ShaderMask(
+                shaderCallback: (bounds) => AppColors.actionOutlineGradient.createShader(bounds),
+                child: Icon(a.icon, size: 24, color: Colors.white),
+              ),
               const SizedBox(width: 10),
               Text(
                 a.label,
@@ -2040,23 +2043,7 @@ class _AgentMark extends StatelessWidget {
           ),
         ],
       ),
-      child: Stack(
-        children: [
-          Positioned(
-            right: 8,
-            top: 8,
-            child: Container(
-              width: 8,
-              height: 8,
-              decoration: BoxDecoration(
-                color: Colors.white.withValues(alpha: 0.72),
-                shape: BoxShape.circle,
-              ),
-            ),
-          ),
-          Center(child: Icon(icon, size: 32, color: Colors.white)),
-        ],
-      ),
+      child: Center(child: Icon(icon, size: 32, color: Colors.white)),
     );
   }
 }