[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/services/version.go

@@ -0,0 +1,22 @@
+//go:build !android && !ios && !freebsd && !js
+
+package services
+
+import (
+	"context"
+
+	"github.com/netbirdio/netbird/version"
+)
+
+// Version reports only the GUI's own version; the daemon version comes from
+// the status feed's DaemonVersion field.
+type Version struct{}
+
+func NewVersion() *Version {
+	return &Version{}
+}
+
+// GUI returns the UI binary's version, stamped via ldflags ("development" if un-stamped).
+func (v *Version) GUI(_ context.Context) string {
+	return version.NetbirdVersion()
+}