fix(ui): typography overrides replace defaults instead of appending

[ssilvius]

Summary

Token props on typography (color, size, weight, line, tracking, family, align, transform) now replace the matching default dimension at emit time instead of appending on top of a flat default string.

Tailwind v4 orders utilities alphabetically in generated CSS, so the cascade cannot be trusted for overrides:

• text-accent would lose to default text-foreground (a < f)
• text-2xl override would lose to default text-4xl
• @lg:text-5xl CQ defaults survived bare size overrides

Audited the other 50+ UI components -- they're fine because they use map-lookup replacement patterns (variantClasses[v], sizeClasses[s]) rather than flat-string append. Typography was the outlier because its props are free-form dimensions (not enum variants) and went through tokenPropsToClasses which appended.

Approach

• typography.classes.ts: variant defaults stored dimensionally (size, weight, color, line, tracking, family, align, transform + optional layout extras + cq responsive overrides), resolved via resolveTypography(variant, props).
• Resolver reads overrides[key] ?? defaults[key] per dimension and emits utilities through a single DIM_TO_UTIL map -- one source of truth for the dimension-to-Tailwind mapping.
• emitProps shared primitive handles both the base emit and the CQ-prefixed emit; tokenPropsToClasses is a one-line wrapper kept as a test-only entry point.
• CQ variants survive only where the matching dimension isn't overridden (so size="2xl" correctly drops @lg:text-5xl).
• typographyClasses flat-string export preserved for consumers that don't take token props (List's li, CodeBlock wrapper), computed from the dimensional defaults.
• All React + Astro typography components switched to resolveTypography. Missing align/transform destructures added to React variants for parity with Astro.
• classy unchanged.
• One-line .gitignore chore adds .scratch/ so scratchwork doesn't gate pushes via biome.

Test plan

• pnpm --filter=@rafters/ui test typography -- 288 tests pass
• Full @rafters/ui suite -- 4907 pass, 6 pre-existing skips
• Typecheck + lint + preflight green
• Override-replaces-default asserted for color, size, weight
• CQ variant survives when the matching dimension is not overridden