Request: Use libcamera to capture an image
In current state the application is not easily usable on mobile devices like the Pinephone for example. This is because they have a camera with multiple sensors not being compatible with zbar and v4l2 which zbar uses typically. So one huge improvement could be to use libcamera in this app and I would event recommend to use it via GStreamer (you can setup a pipeline with libcamera, zbar and an accelerated sink).
With libcamera it would also be possible to choose the specific sensor from front or rear camera.