Add :scales config to tokens.edn with two generated scales:
- Size (linear): --size-1 through --size-16, base 0.25rem × N
- Font (geometric): --font-xs through --font-3xl, ratio 1.25
gen.clj computes values and emits them into :root only (not dark
theme blocks). button.css now uses scale vars instead of raw rem.
Change base or ratio in tokens.edn to recompute the entire scale.
- Rename CSS classes from BEM double-dash (btn--primary) to flat
utility-style single-dash (btn-primary)
- Move button CSS from inline Clojure string in gen.clj to
src/ui/button.css next to button.cljc
- gen.clj now auto-collects all src/ui/*.css files via babashka.fs glob
- Replace clojure.java.io with babashka.fs throughout gen.clj
- Update AGENTS.md to reflect new conventions
Move font-family, background, color, margin, and transition from
duplicated inline <style> blocks in each dev target into the CSS
generator (base-css). Dev pages now only set page-specific padding.
Also fixes hiccup target rendering the wrong font due to hiccup2
HTML-escaping quotes inside <style> tags, and adds missing <!DOCTYPE>.
