Closes incidencia point B (range field shouldn't show two separate
boxes). New CSS contract: `[data-date-range-field-group]` on the
wrapper element collapses the chrome around its descendants:
- The group owns the border, background, focus ring, invalid state,
variant/ghost treatment, and disabled opacity.
- Each `[data-date-range-field-input]` inside loses its own border,
background, and padding; it just contributes its segments to the
shared row.
- The "to" separator (.range-separator or `[data-range-separator]`)
picks up the field's literal tone.
- The embedded trigger from the previous commit sits flush at the
trailing edge of the group, since `data-date-field-input` already
detects the embedded case.
Demo: add `data-date-range-field-group` to the `.range-field-row`
wrapper. Visually now reads as one input pill: `05 / 20 / 2026 to
06 / 03 / 2026 📅`.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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