fix: make router socket non-blocking to prevent poll loop stalls

sketch/Font.h

@@ -0,0 +1,18 @@
+/*
+  This file is part of the ArduinoGraphics library.
+  Copyright (c) 2025 Arduino SA. All rights reserved.
+*/
+
+#ifndef _FONT_H
+#define _FONT_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+struct Font {
+  const int width;
+  const int height;
+  const uint8_t** data;
+};
+
+#endif