icon presets

The one identity icon resolver over local presets and the established Iconify namespace, including validation, aliases, SVG serialization, and favicon hrefs.

Identity icons are named values, not page-local drawings. One browser-safe resolver owns the small featured registry's stable ids, accessible labels, palette, view box, and geometry, plus the established broad Iconify prefix:name namespace that the original tab identity accepted through api.iconify.design. Backend validation, the dashboard renderer, and the compact searchable/source-filtered chooser consume that same contract. The existing dashboard.icon field stores the chosen human-readable value; no catalog result is copied into another identity field. Emoji, arbitrary Iconify names, and URLs already authored directly remain valid through the adapter; structured chooser writes accept canonical registry ids and well-formed Iconify names, while rejecting other new arbitrary strings.

The same serializer produces browser favicon data URLs from a registry row, so the visual picker, project rows, scoped rail, global gateway mark, and browser tab cannot drift into separate variants. Missing values use the documented default; structured host writes reject malformed choices before touching disk without invalidating legacy values already authored directly.