## Slider thumb misalignment
`SliderThumbProvider.thumbStyle` used `translate(50%, -50%)` for both LTR
and RTL. For LTR that pushed the thumb RIGHT by half its width from the
`left: X%` anchor — visible symptoms in the time-picker / time-range-picker
demos:
- thumb never reached `left: 0` (centre at value=0 was offset by
thumbWidth/2)
- thumb overshot the track on the right edge at value=max
- drag felt off by the same amount throughout
Fix: use `translate(-50%, -50%)` for LTR (thumb centre aligns with anchor)
and keep `translate(50%, -50%)` for RTL (anchor is `right: X%`, thumb must
shift right by half its width to centre-align). Matches the logic already
used by `SliderTickProvider` which chose `tx = isRtl ? '50%' : '-50%'`.
Browser probe confirms: value=0 now centres at 0%, value=30/59 at ~50.8%,
style attribute reports `translate(-50%, -50%)` in LTR.
## soma README documents morfo
Added §4b "Morfo — contrato declarativo cross-layer" covering: why morfo
exists (6-place drift without it), how providers consume it
(`createAttrs(morfo)` + `registerContract(morfo)`), the mandatory
`as const satisfies Morfo` authoring pattern for literal-typed inference,
the 3-layer validation pipeline (schema / assertContract / morfo-check),
and the boundary (what does NOT go in morfo — props, prose, langs, state
machines, visual recipes). Updated the §4 structure listing so
`attrs/create-attrs.ts` shows the new signature.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
dev
2627dc2094