xs propagation
- Add [data-size='xs'] blocks to calendar.css, date-picker.css,
date-range-picker.css (root + inline range calendar).
- Extend CalendarSize union with 'xs'; DatePicker / DateRangePicker
inherit it through their type re-exports.
- date-picker-content + date-range-picker-content clamp xs to sm when
forwarding to PopoverContent (PopoverSize starts at sm; the calendar
inside still receives xs via data-size).
- size chip groups in calendar / date-picker / date-range-picker demos
now list xs / sm / md / lg.
date-picker demo: fix duplicate footer
- The `calendarBody` snippet had a hardcoded <DatePicker.Footer> that
rendered alongside the controllable `pickerFooter` snippet, producing
two footer rows when showFooter=true. Removed the hardcoded one.
Verified in browser:
- date-picker size='xs' -> data-date-field-input height 26px
(control-height-xs), padding 8px (space-2), font-size 12px.
- date-picker popover now shows a single footer.
- svelte-check --threshold error -> 0 errors / 0 warnings / 4572 files.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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