How to use:
• Y-Axis: Vibration intensity (0-127, top = max intensity, bottom = 0)
• X-Axis: Time (1 pixel = 1/SampleRate seconds)
• Draw: Click and drag to create vibration patterns
• Erase: Check "Erase Mode" to remove parts of the pattern
• Export: Generates PATTERN command for your ESP32

ESP32 Commands:
• Send generated pattern to ESP32 via serial
• Use "PLAY" command to start the pattern
• Use "STOP" command to stop playback
• Pattern format: PATTERN:intensity1,duration1,intensity2,duration2,...