Add pre-build script to patch core's pins_arduino.h with Launchpad X VID/PID

- pre_build.py patches framework-arduinoespressif32/variants/esp32s3_devkitc/pins_arduino.h
- Replaces USB_VID 0x303a -> 0x1235, USB_PID 0x1001 -> 0x0103
- Adds USB_MANUFACTURER/PRODUCT

pre_build.py

@@ -0,0 +1,46 @@
+import os
+import fileinput
+
+def patch_usb_ids():
+    # Find the core's pins_arduino.h for ESP32-S3 DevKitC-1
+    core_variants = os.path.expanduser("~/.platformio/packages/framework-arduinoespressif32/variants")
+    if not os.path.exists(core_variants):
+        # Try PlatformIO default location
+        core_variants = os.path.join(os.environ.get("PLATFORMIO_PACKAGES_DIR", ""), "framework-arduinoespressif32", "variants")
+    
+    pins_file = os.path.join(core_variants, "esp32s3_devkitc", "pins_arduino.h")
+    
+    if not os.path.exists(pins_file):
+        # Try alternative variant name
+        pins_file = os.path.join(core_variants, "esp32s3", "pins_arduino.h")
+    
+    if os.path.exists(pins_file):
+        print(f"Patching {pins_file} with Launchpad X VID/PID")
+        
+        # Read and replace
+        with open(pins_file, 'r') as f:
+            content = f.read()
+        
+        # Replace USB_VID and USB_PID
+        content = content.replace(
+            '#define USB_VID 0x303a',
+            '#define USB_VID 0x1235'
+        )
+        content = content.replace(
+            '#define USB_PID 0x1001',
+            '#define USB_PID 0x0103'
+        )
+        # Add manufacturer/product if not present
+        if 'USB_MANUFACTURER' not in content:
+            content = content.replace(
+                '#define USB_PID 0x0103',
+                '#define USB_PID 0x0103\n#define USB_MANUFACTURER "Novation"\n#define USB_PRODUCT "Launchpad X"'
+            )
+        
+        with open(pins_file, 'w') as f:
+            f.write(content)
+        print("USB VID/PID patched successfully")
+    else:
+        print(f"WARNING: Could not find pins_arduino.h at {pins_file}")
+
+patch_usb_ids()