Update platformio.ini: Add USB mode flag and sync test version

Changes:
- Added -DARDUINO_USB_MODE=1 for Feather ESP32-S3 TFT environment
- Updated test environment version from 2.0.0 to 3.0.0
- Added -DARDUINO_USB_MODE=1 for test environment
- Fixed formatting in build_flags sections

The ARDUINO_USB_MODE=1 flag enables proper USB CDC support for
ESP32-S3, ensuring serial communication works correctly.

Author: arunkumar-mourougappane

platformio.ini

@@ -33,6 +33,7 @@ monitor_speed = 115200
 upload_port = /dev/ttyACM*
 monitor_port = /dev/ttyACM*
 build_flags = 
+    -DARDUINO_USB_MODE=1
     -DVERSION="3.0.0"
     -DUSE_NEOPIXEL=1
 lib_deps = 
@@ -69,12 +70,14 @@ lib_deps =
     adafruit/Adafruit NeoPixel@^1.12.0
     ESP Async UDP@^1.2.3
 build_flags = 
-    -D UNITY_INCLUDE_CONFIG_H
-    -D UNIT_TEST
-    -D USE_NEOPIXEL=1
-    -D VERSION='"2.0.0"'
+    -DARDUINO_USB_MODE=1
+    -DUNITY_INCLUDE_CONFIG_H
+    -DUNIT_TEST
+    -DUSE_NEOPIXEL=1
+    -DVERSION='"3.0.0"'
 monitor_speed = 115200
 upload_port = /dev/ttyACM*
 monitor_port = /dev/ttyACM*
+
 test_ignore = 
     test_desktop_*