feat(chat): adiciona separador de dias e melhora layout do header

- Adiciona separador de data entre mensagens de dias diferentes (estilo WhatsApp)
- Mostra "Hoje", "Ontem" ou data completa (ex: "segunda-feira, 15 de dezembro")
- Separa hostname da maquina em linha propria no header
- Hostname com truncate e tooltip para nomes longos

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

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

src/components/chat/chat-widget.tsx

@@ -53,6 +53,40 @@ function formatTime(timestamp: number) {
   })
 }
 
+function formatDateSeparator(timestamp: number) {
+  const date = new Date(timestamp)
+  const today = new Date()
+  const yesterday = new Date(today)
+  yesterday.setDate(yesterday.getDate() - 1)
+
+  const isToday = date.toDateString() === today.toDateString()
+  const isYesterday = date.toDateString() === yesterday.toDateString()
+
+  if (isToday) return "Hoje"
+  if (isYesterday) return "Ontem"
+
+  return date.toLocaleDateString("pt-BR", {
+    weekday: "long",
+    day: "2-digit",
+    month: "long",
+  })
+}
+
+function getDateKey(timestamp: number) {
+  return new Date(timestamp).toDateString()
+}
+
+// Componente separador de data (estilo WhatsApp)
+function DateSeparator({ timestamp }: { timestamp: number }) {
+  return (
+    <div className="flex items-center justify-center py-2">
+      <div className="rounded-full bg-slate-200/80 px-3 py-1 text-xs font-medium text-slate-600">
+        {formatDateSeparator(timestamp)}
+      </div>
+    </div>
+  )
+}
+
 type ChatSession = {
   ticketId: string
   ticketRef: number
@@ -661,16 +695,22 @@ export function ChatWidget() {
                   )}
                 </div>
                 {activeSession && (
-                  <a
+                  <div className="flex flex-col">
-                    href={`/tickets/${activeTicketId}`}
+                    <a
-                    target="_blank"
+                      href={`/tickets/${activeTicketId}`}
-                    rel="noopener noreferrer"
+                      target="_blank"
-                    className="group flex items-center gap-1 text-xs text-slate-500 hover:text-slate-900 transition-colors"
+                      rel="noopener noreferrer"
-                  >
+                      className="group flex items-center gap-1 text-xs text-slate-500 hover:text-slate-900 transition-colors"
-                    <span>#{activeSession.ticketRef}</span>
+                    >
-                    {machineHostname && <span> - {machineHostname}</span>}
+                      <span>#{activeSession.ticketRef}</span>
-                    <ExternalLink className="size-3 opacity-0 group-hover:opacity-100 transition-opacity" />
+                      <ExternalLink className="size-3 opacity-0 group-hover:opacity-100 transition-opacity" />
-                  </a>
+                    </a>
+                    {machineHostname && (
+                      <span className="max-w-[140px] truncate text-xs text-slate-400" title={machineHostname}>
+                        {machineHostname}
+                      </span>
+                    )}
+                  </div>
                 )}
               </div>
             </div>
@@ -757,16 +797,22 @@ export function ChatWidget() {
               </div>
             ) : (
               <div className="space-y-3">
-                {messages.map((msg) => {
+                {messages.map((msg, index) => {
                   const isOwn = String(msg.authorId) === String(viewerId)
                   const bodyText = msg.body?.trim() ?? ""
                   const shouldShowBody =
                     bodyText.length > 0 &&
                     !(bodyText === "[Anexo]" && (msg.attachments?.length ?? 0) > 0)
+                  
+                  // Verificar se precisa mostrar separador de data
+                  const prevMsg = index > 0 ? messages[index - 1] : null
+                  const showDateSeparator = !prevMsg || getDateKey(msg.createdAt) !== getDateKey(prevMsg.createdAt)
+                  
                   return (
-                    <div
+                    <div key={msg.id}>
-                      key={msg.id}
+                      {showDateSeparator && <DateSeparator timestamp={msg.createdAt} />}
-                      className={cn("flex gap-2", isOwn ? "flex-row-reverse" : "flex-row")}
+                      <div
+                        className={cn("flex gap-2", isOwn ? "flex-row-reverse" : "flex-row")}
                     >
                       <div
                         className={cn(
@@ -803,6 +849,7 @@ export function ChatWidget() {
                         </p>
                       </div>
                     </div>
+                    </div>
                   )
                 })}
                 <div ref={messagesEndRef} />