fdroid finds a launcher icon only under res/<folder>/<name>.png, and
release APKs shorten the resources' paths (res/9w.png; fdroidserver
issue 885), so the app showed no icon in the F-Droid app.
tool/fdroid_repo.sh now gives it the snap's icon in the metadata
(metadata/app.halkyon.learn/en-US/icon.png), as the repository's own.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>