[client] UI refactor (#6069)

Refactor UI

---------

Co-authored-by: Eduard Gert <kontakt@eduardgert.de>
Co-authored-by: braginini <bangvalo@gmail.com>
Co-authored-by: Pascal Fischer <32096965+pascal-fischer@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: riccardom <riccardomanfrin@gmail.com>

client/server/status_stream.go

@@ -0,0 +1,57 @@
+package server
+
+import (
+	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/client/proto"
+)
+
+// SubscribeStatus pushes a fresh StatusResponse on every connection state
+// change. The first message is the current snapshot, so a re-subscribing
+// client doesn't need to also call Status. Subsequent messages fire when
+// the peer recorder reports any of: connected/disconnected/connecting,
+// management or signal flip, address change, or peers list change.
+//
+// The change channel coalesces bursts to a single tick. If the consumer
+// is slow the daemon drops extras (not blocks), and the next snapshot
+// the consumer pulls already reflects everything.
+func (s *Server) SubscribeStatus(req *proto.StatusRequest, stream proto.DaemonService_SubscribeStatusServer) error {
+	subID, ch := s.statusRecorder.SubscribeToStateChanges()
+	defer func() {
+		s.statusRecorder.UnsubscribeFromStateChanges(subID)
+		log.Debug("client unsubscribed from status updates")
+	}()
+
+	log.Debug("client subscribed to status updates")
+
+	if err := s.sendStatusSnapshot(req, stream); err != nil {
+		return err
+	}
+
+	for {
+		select {
+		case _, ok := <-ch:
+			if !ok {
+				return nil
+			}
+			if err := s.sendStatusSnapshot(req, stream); err != nil {
+				return err
+			}
+		case <-stream.Context().Done():
+			return nil
+		}
+	}
+}
+
+func (s *Server) sendStatusSnapshot(req *proto.StatusRequest, stream proto.DaemonService_SubscribeStatusServer) error {
+	resp, err := s.buildStatusResponse(stream.Context(), req)
+	if err != nil {
+		log.Warnf("build status snapshot for stream: %v", err)
+		return err
+	}
+	if err := stream.Send(resp); err != nil {
+		log.Warnf("send status snapshot to stream: %v", err)
+		return err
+	}
+	return nil
+}