added mpris (linux media player controls) support

backend/mediacontrols/stub.go

@@ -0,0 +1,30 @@
+//go:build !linux
+
+package mediacontrols
+
+import "log/slog"
+
+// stubHandler is a no-op Handler for platforms without media control
+// integration.
+type stubHandler struct{}
+
+// NewHandler returns a no-op handler on unsupported platforms.
+func NewHandler(_ *slog.Logger) Handler {
+	return &stubHandler{}
+}
+
+func (s *stubHandler) Init(_ Callbacks) error { return nil }
+
+func (s *stubHandler) UpdateMetadata(_ Metadata) {}
+
+func (s *stubHandler) UpdatePlaybackState(
+	_ PlaybackState,
+	_ int,
+) {
+}
+
+func (s *stubHandler) NotifySeek(_ int) {}
+
+func (s *stubHandler) UpdateVolume(_ float64) {}
+
+func (s *stubHandler) Close() {}