No screenshots in the manifest, so desktop Chrome shows its small install dialog

[isenbek]

The app is installable and already met Chrome's bar: a manifest with a name,
192px and 512px icons, a start_url in scope, display: standalone, and a
service worker with a fetch handler. display_override, launch_handler,
handle_links and shortcuts were added as polish.

What is missing is screenshots. Without at least one carrying
form_factor: "wide", desktop Chrome shows its small install dialog rather than
the rich one.

Why it has not been done

Capturing them means running a browser at deploy time, and the deploy runs under
systemd where a browser is neither installed nor wanted. This is deliberate
rather than forgotten.

Possible approaches

• Capture by hand, commit the PNGs, and reference them from the manifest. Cheap,
  and they go stale silently — which is the failure mode this project usually
  refuses.
• Capture in a CI job (see the CI issue) and publish them as build artifacts.
• Accept the small dialog and remove this from the known-gaps list.

Note the manifest is a fourth place shipped text lives and is not covered by
grep '—' web/*.js web/*.html. One em dash survived a whole pass there.