Implementa sistema de chat em tempo real entre agente e cliente

- Adiciona tabela liveChatSessions no schema Convex
- Cria convex/liveChat.ts com mutations e queries para chat
- Adiciona API routes para maquinas (sessions, messages, poll)
- Cria modulo chat.rs no Tauri com ChatRuntime e polling
- Adiciona comandos de chat no lib.rs (start/stop polling, open/close window)
- Cria componentes React do chat widget (ChatWidget, types)
- Adiciona botao "Iniciar Chat" no dashboard (ticket-chat-panel)
- Implementa menu de chat no system tray
- Polling de 2 segundos para maior responsividade
- Janela de chat flutuante, frameless, always-on-top

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

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

apps/desktop/src/chat/index.tsx

@@ -0,0 +1,20 @@
+import { ChatWidget } from "./ChatWidget"
+
+export function ChatApp() {
+  // Obter ticketId da URL
+  const params = new URLSearchParams(window.location.search)
+  const ticketId = params.get("ticketId")
+
+  if (!ticketId) {
+    return (
+      <div className="flex h-screen flex-col items-center justify-center bg-white p-4">
+        <p className="text-sm text-red-600">Erro: ticketId nao fornecido</p>
+      </div>
+    )
+  }
+
+  return <ChatWidget ticketId={ticketId} />
+}
+
+export { ChatWidget }
+export * from "./types"