fix: ajustes visuais na janela de chat do desktop

- Remove scrollbars com overflow: hidden no CSS
- Aumenta tamanho da janela minimizada (210x52) para não cortar badge
- Adiciona bordas arredondadas (rounded-2xl) no chat expandido
- Adiciona sombra (shadow-xl) no chat expandido

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/desktop/src/chat/ChatWidget.tsx

@@ -412,11 +412,11 @@ export function ChatWidget({ ticketId }: ChatWidgetProps) {
   }
 
   return (
-    <div className="flex h-screen flex-col bg-white">
+    <div className="flex h-screen flex-col overflow-hidden rounded-2xl bg-white shadow-xl">
       {/* Header - arrastavel */}
       <div
         data-tauri-drag-region
-        className="flex items-center justify-between border-b border-slate-200 bg-slate-50 px-4 py-3"
+        className="flex items-center justify-between border-b border-slate-200 bg-slate-50 px-4 py-3 rounded-t-2xl"
       >
         <div className="flex items-center gap-3">
           <div className="flex size-10 items-center justify-center rounded-full bg-black text-white">