feat(eidos): port range-calendar from soma + extract shared partial
Standalone eidos `<RangeCalendar>` wrapper over the soma range-calendar
primitive. Adds size / variant / color cascades; otherwise pass-through
14 compound parts (Provider, Header, Heading, PrevButton, NextButton,
MonthSelect, YearSelect, Grid, GridHead, GridBody, GridRow, HeadCell,
Cell, Day).
## Feature comparison
| Feature | bits-ui | ark-ui | react-aria | Eidos |
|----------------------|---------|--------|------------|-------|
| Range start/end | ✓ | ✓ | ✓ | ✓ |
| Hover preview state | ✓ | ✓ | ✓ | ✓ |
| minDays / maxDays | — | — | ✓ | ✓ |
| allowSingleDay | ✓ | ✓ | ✓ | ✓ |
| preventDeselect | ✓ | ✓ | — | ✓ |
| Multi-month display | ✓ | ✓ | ✓ | ✓ |
| Week-number column | — | — | ✓ | ✓ |
| Month/Year selects | — | ✓ | — | ✓ |
| Disabled / readonly | ✓ | ✓ | ✓ | ✓ |
| isDateUnavailable | ✓ | ✓ | ✓ | ✓ |
| Holiday markers | — | — | — | ✓ |
| Locale / dir | ✓ | ✓ | ✓ | ✓ |
| Size cascade | — | — | — | ✓ 4 |
| Variant cascade | — | — | — | ✓ 3 |
| Color cascade | — | — | — | ✓ 8 |
## Range-cells partial extracted
The recipe at `src/uix/eidos/components/range-calendar/range-calendar.css`
now owns ALL `[data-range-calendar-*]` selectors — the shared rules
that previously lived inside `date-range-picker.css` (lines 537-834)
moved here. Both consumers (the standalone `<RangeCalendar>` and
`<DateRangePicker>`'s popover content) stamp the same data-attrs, so the
same selectors paint without duplication.
`date-range-picker.css` drops 298 lines of duplication; it keeps only
the picker-specific scope overrides (`[data-date-range-picker-calendar]`
with no chrome, max-content sizing, transparent bg).
## Morfo
Extended `rangeCalendarMorfo.scope` to include `'eidos'` so the new
wrapper appears in the eidos-layer inventory and the demo Morfo tab
declares it correctly.
## Demo
Canonical 6-tab depth (~600L) at `/uix/components/range-calendar`. Live
tab exposes every range-specific prop: minDays / maxDays sliders,
allowSingleDay, preventDeselect, numberOfMonths chips (1 / 2 / 3),
pagedNavigation, fixedWeeks, showWeekNumbers, disableDaysOutsideMonth,
weekStartsOn, disabled, readonly, locale, plus size / variant / color
cascades.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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