feat: melhorias no sistema de chat ao vivo

- Chat do agente abre expandido automaticamente ao iniciar nova sessao
- Toasts fecham apos tempo fixo independente do foco da janela
- Janela de chat do desktop com transparencia (sem fundo branco)
- Chat reabre quando usuario abre o Raven (duplo clique no tray)
- Chat nao reabre sozinho com novas mensagens (apenas notificacao)
- Mensagem de toast simplificada: "Chat ao vivo iniciado"
- Reduz intervalo de polling SSE de 2s para 1s (mais responsivo)

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

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

src/components/ui/sonner.tsx

@@ -1,11 +1,11 @@
-"use client"
-
-import { useTheme } from "next-themes"
-import { Toaster as Sonner, ToasterProps } from "sonner"
-
-const Toaster = ({ ...props }: ToasterProps) => {
-  const { theme = "system" } = useTheme()
-
+"use client"
+
+import { useTheme } from "next-themes"
+import { Toaster as Sonner, ToasterProps } from "sonner"
+
+const Toaster = ({ ...props }: ToasterProps) => {
+  const { theme = "system" } = useTheme()
+
   const baseClass =
     "inline-flex w-auto min-w-0 items-center justify-center gap-2 self-center rounded-xl border border-black bg-black px-3 py-2 text-sm font-medium text-white shadow-lg"
   const baseStyle = {
@@ -23,6 +23,7 @@ const Toaster = ({ ...props }: ToasterProps) => {
     <Sonner
       theme={theme as ToasterProps["theme"]}
       className="toaster group"
+      pauseWhenPageIsHidden={false}
       toastOptions={{
         className: baseClass,
         style: baseStyle,
@@ -44,6 +45,6 @@ const Toaster = ({ ...props }: ToasterProps) => {
       {...props}
     />
   )
-}
-
-export { Toaster }
+}
+
+export { Toaster }