The picker accepts one MP4 or WebM, the thread lightbox zooms photos, and Discord gets the video as a file on a follow-up message so photo embeds still render.
Lands the image upload handlers and picker on master. Questions and replies can attach up to four JPEG, PNG, or WebP photos.
Reviewed-on: #20
Co-authored-by: codegirl-007 <s.raide@gmail.com>
codegirl007