It turns out the cropper is _way_ too hard to use on mobile. The
cropper handles are much too small for a touch screen. Maybe I can
figure out how to improve the UX eventually, but for now, Tabitha
requested that we remove that functionality.
I've implemented the UI using TypeScript and Shoelace. I originally
started with Pico CSS, but I didn't really like its visuals. Since
capturing photos using the camera requires JavaScript, and that's
basically the entire point of this application, Shoelace's JavaScript
dependency (for WebComponents), is acceptable.
The photo capture uses the Media Capture Web API, which exposes the
camera directly as a video stream. We capture a frame from this stream
and save it in a canvas, which we then pass to Cropper.js to let the
user select only the relevant portion of the picture containing the
receipt itself.
Dustin