Full port of astro-site-runtime tokens.css (183 tokens, V2 bright-blue)
and base.css (element baseline, layout utilities, forms, FAQ, reveal
motion, 620px mobile block) into the trade-pro theme. All cms variables
renamed with the --sf-tp- prefix keeping semantic names; button system
rebuilt as sf-tp-btn with sm/lg sizes and ghost/outline/round variants
so platform custom.css (.btn/.primary/.request/.button/.nav-btn) can
never restyle it. Phase-2 short token aliases (--sf-tp-primary etc.)
and .pro-* bridge rules retained, now driven by the cms tokens.
Co-Authored-By: Claude Code <noreply@anthropic.com>
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