A panic writes the build, system, renderer, thread, uptime, message and
backtrace beside the settings, paths and the open notebooks' and sections'
names hidden; the browser keeps it in local storage. The next launch asks
Send Report, Show Report or Don't Send, and posts to the site's /crash only on
Send, through the updater's proxy and roots. Each platform's dialogs gain a
choice of buttons, which confirm now rides on. Debug builds crash on
SNOWBOUND_CRASH and send to SNOWBOUND_CRASH_SITE.

Assisted-by: claude-opus-5.5