* feat(doc): fix phrasing
* ci: add upstream mapping sync check to quality workflow
Problem: mapping.lua can silently fall behind the ya2s/nonicons font
repo with no indication that new icons are available.
Solution: add a mapping-sync job that fetches nonicon.json from
upstream, generates the expected mapping.lua, and fails the check
if they differ.
* fix: sort alphabetically
* fix(ci): dont respect alphabetical order in font checker
Problem: the original ya2s/nvim-nonicons fork diverged enough that
maintaining it as a fork was pointless. The set_icon() approach broke
with modern nvim-web-devicons, and the extensions directory coupled
integrations that belong in user config.
Solution: from-scratch rewrite with function wrapping + table mutation
override engine, vim.g.nonicons config pattern, vendored mapping with
integer codepoints, health check, vimdoc with recipes, and no built-in
plugin integrations.
