https://github.com/todbot/electron-blink1-toy/ https://github.com/todbot/tauri-blink1-toy/
@todbot If you're already good with C++, maybe consider wxWidgets?
While a bit more than a blink example, this little program I wrote a couple years ago weighs in at 6.5MB for a static linked Windows app. Linux build is smaller, and MacOS larger but due to universal binary (both ARM64 & X86-64).
https://github.com/PaulStoffregen/Phazerville-Screen-Capture
Great thing about wxWidgets is you get a native GUI app on all 3 systems. It's the GUI toolkit KiCAD uses. If you know and like C++, wxWidgets is really worthwhile.
@todbot wxWidgets isn't the simplest, but with it's relatively new Bind() function building a small GUI takes relatively little code. You can see that little app has under 200 lines for the GUI, but manages to implement a window with a few small menus, graphical copy & paste, and ~30Hz screen update from a USB device.
Huge advantage of C++ is you get best access native OS APIs. If you look at usb.c in my app, it has native WIN32, Linux udev, and MacOS IOKit to discover and use USB devices.