client: ack channel <status> stanzas to stop 50-minute stream recycling

The server delivers channel status updates as <status> stanzas. Without a
registered node handler they were dropped unacked, so the server redelivered
them on every connect and closed the stream every 50 minutes with
<stream:error><ack class="status" .../></stream:error>.

client.go

@@ -295,6 +295,7 @@ func NewClient(deviceStore *store.Device, log waLog.Logger) *Client {
 		"chatstate":    cli.handleChatState,
 		"presence":     cli.handlePresence,
 		"notification": cli.handleNotification,
+		"status":       cli.handleStatusUpdate,
 		"success":      cli.handleConnectSuccess,
 		"failure":      cli.handleConnectFailure,
 		"stream:error": cli.handleStreamError,

statusupdate.go

@@ -0,0 +1,22 @@
+// Copyright (c) 2026 Tulir Asokan
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package whatsmeow
+
+import (
+	"context"
+
+	waBinary "go.mau.fi/whatsmeow/binary"
+)
+
+// handleStatusUpdate acknowledges <status> stanzas (channel status updates).
+// The content isn't parsed into events yet, but the stanza must be acked:
+// otherwise the server redelivers it on every connect and recycles the
+// connection every 50 minutes with
+// <stream:error><ack class="status" id="..." type="..."/></stream:error>.
+func (cli *Client) handleStatusUpdate(ctx context.Context, node *waBinary.Node) {
+	defer cli.maybeDeferredAck(ctx, node)()
+}