Add custom pins_arduino.h variant with Launchpad X VID/PID

- variants/esp32s3/pins_arduino.h overrides USB_VID/USB_PID
- Included via -I in build_flags before core variant
- This should force USB descriptors at hardware level

variants/esp32s3/pins_arduino.h

@@ -0,0 +1,17 @@
+// pins_arduino.h for ESP32-S3 DevKitC-1 with Launchpad X USB VID/PID
+
+#ifndef _VARIANT_ESP32S3_DEVKITC_1_
+#define _VARIANT_ESP32S3_DEVKITC_1_
+
+#include <stdint.h>
+
+// Override USB VID/PID to match Novation Launchpad X (0x1235/0x0103)
+// This must be before Arduino.h includes it
+#define USB_VID 0x1235
+#define USB_PID 0x0103
+#define USB_MANUFACTURER "Novation"
+#define USB_PRODUCT "Launchpad X"
+
+#include "../../.pio/packages/framework-arduinoespressif32/variants/esp32s3_devkitc/pins_arduino.h"
+
+#endif