The icon name "steam-dice" triggers freedesktop's compound-name
fallback: when not found, it strips "-dice" and resolves to the
Steam package's icon. Switch to io.github.silvernode.SteamDice
so the fallback can't collide with anything pre-existing.
Also add .gitignore for makepkg build artifacts and pycache.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>