If you need a UI, flutter is great, but for a complete beginner it has a bit of a learning curve.
Maybe you could start with a small PWA (progressive web app) using Javascript or typescript. You can do it all in the front-end for something small like this, though you won’t be able to implement some features like synchronization across devices
I already thought about disabling the dedicated GPU on that laptop, but I unfortunately cannot since I need it to train neural networks and the occasional lan party at, work