Same reasoning as breadbar/breadbox/breadclip/breadsearch, but plumbed
through breadpad's own hand-rolled arg parser (mod args) instead of clap
— breadpad doesn't use clap at all, and adding a second, separate clap
parser alongside the existing one would reject every one of breadpad's
real flags (--type, --no-classify, --status, fire, calendar, ...) the
moment it saw one clap didn't recognize. --screenshot/--output/--width/
--height are just three more fields on the same Args struct.
Only the "popup" view (the compose window) is wired up — the reminder
window needs a real stored Note to render, not worth fabricating one
just for a screenshot pass.
Also fixes the same single-instance footgun as the other apps: without
NON_UNIQUE, a screenshot run would just toggle-close the operator's real
already-open popup instead of getting its own window.
879ec1e7f4