fix: remove propriedades CSS inválidas/vazias e adiciona compatibilidade com line-clamp padrão

public/style.css

@@ -601,7 +601,6 @@ body {
   text-decoration: none;
   position: relative;
   transition: background-color var(--transition-fast);
-  group-hover: opacity 1;
 }
 
 .history-item:hover {
@@ -995,10 +994,6 @@ body {
   animation: fadeInUp var(--transition-normal);
 }
 
-.message-row.user {
-  /* Alinhamento sutil para o usuário se destacar */
-}
-
 .message-icon {
   flex-shrink: 0;
 }
@@ -2995,6 +2990,7 @@ code {
   line-height: 1.4;
   display: -webkit-box;
   -webkit-line-clamp: 2;
+  line-clamp: 2;
   -webkit-box-orient: vertical;
   overflow: hidden;
 }