[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/ui/tray_notify.go

@@ -0,0 +1,58 @@
+//go:build !android && !ios && !freebsd && !js
+
+package main
+
+import (
+	"context"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/wailsapp/wails/v3/pkg/services/notifications"
+
+	"github.com/netbirdio/netbird/client/ui/services"
+)
+
+const notifyIDDaemonOutdated = "netbird-daemon-outdated"
+
+// sendFn fits both NotificationService.SendNotification and SendNotificationWithActions.
+type sendFn func(notifications.NotificationOptions) error
+
+// safeSendNotification sends a best-effort OS notification, swallowing errors and panics.
+//
+// The panic guard is load-bearing on Linux: when Wails' notifier fails to
+// connect the session bus at startup (headless, unreachable
+// DBUS_SESSION_BUS_ADDRESS) it stays registered with a nil *dbus.Conn, so the
+// next send nil-derefs inside godbus. Because sends run on a Wails
+// event-dispatch goroutine that panic is fatal process-wide; recover() turns
+// it into a logged no-op.
+func safeSendNotification(send sendFn, what string, opts notifications.NotificationOptions) (err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			log.Errorf("notify %s: recovered from panic (notification bus unavailable): %v", what, r)
+			err = nil
+		}
+	}()
+	if err := send(opts); err != nil {
+		log.Errorf("notify %s: %v", what, err)
+		return err
+	}
+	return nil
+}
+
+// notifyIfDaemonOutdated probes the daemon once and fires an OS toast when it
+// is reachable but too old for this UI. A probe error means the daemon isn't
+// reachable (not outdated), so it is left to the normal connection flow.
+func notifyIfDaemonOutdated(compat *services.Compat, notifier *notifications.NotificationService, loc *Localizer) {
+	ready, err := compat.DaemonReady(context.Background())
+	if err != nil {
+		log.Debugf("daemon compatibility probe: %v", err)
+		return
+	}
+	if ready {
+		return
+	}
+	_ = safeSendNotification(notifier.SendNotification, "daemon-outdated", notifications.NotificationOptions{
+		ID:    notifyIDDaemonOutdated,
+		Title: loc.T("notify.daemonOutdated.title"),
+		Body:  loc.T("notify.daemonOutdated.body"),
+	})
+}