The typed icon set: every heroicon the site ships, as an atom.

Generated at compile time from deps/heroicons (24px solid set), so the atoms are the icon catalog — :trophy, :currency_dollar, :academic_cap, … all 324 of them. Anything choosing an icon in code does it through a typed value; an unknown atom raises instead of silently rendering nothing.

svg/1 returns the icon's inline SVG (compile-time embedded), which is how <.entity_icon> renders fallbacks — deliberately not the hero-* CSS classes, because Tailwind only generates those for names it finds literally in source, and these names are chosen at runtime.

Entities with no uploaded icon_url fall back to default/1 for their type: every group without an icon shares one icon, every tournament another, and so on. API clients get icon_url as null and apply their own equivalent.