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>

convex/machines.ts

@@ -1002,6 +1002,13 @@ export const listByTenant = query({
           })
         ).then((arr) => arr.filter(Boolean) as Array<{ id: string; email: string; name: string }>)
 
+        // ticket count
+        const ticketCount = await ctx.db
+          .query("tickets")
+          .withIndex("by_tenant_machine", (q) => q.eq("tenantId", tenantId).eq("machineId", machine._id))
+          .collect()
+          .then((tickets) => tickets.length)
+
         const companyFromId = machine.companyId ? companyById.get(machine.companyId) ?? null : null
         const companyFromSlug = machine.companySlug ? companyBySlug.get(machine.companySlug) ?? null : null
         const resolvedCompany = companyFromId ?? companyFromSlug
@@ -1054,6 +1061,7 @@ export const listByTenant = query({
           usbPolicy: machine.usbPolicy ?? null,
           usbPolicyStatus: machine.usbPolicyStatus ?? null,
           usbPolicyError: machine.usbPolicyError ?? null,
+          ticketCount,
         }
       })
     )