add: Calendar and DatePicker components

[davedbase]

Adds three new date/time components to @kobalte/core, built on @internationalized/date throughout (never native Date), and wires them into the public export surface (packages/core/src/index.tsx had commented-out Calendar/DatePicker exports left over from a previous attempt — those are now live).

• DateField — a segmented date/time input (react-spectrum-derived, same lineage as every other Kobalte form component). Supports single/multi-segment editing via keyboard, non-Gregorian calendars via createCalendar, granularity control, and the standard form-control system (validationState, required, disabled, readOnly, HTML form integration via a hidden input).
• Calendar — a date grid supporting single/multiple/range selection, full keyboard navigation, and non-Gregorian calendars. Date math, formatting, and keyboard nav are react-spectrum-derived; range selection follows corvu/calendar's click-only model instead of pointer-drag (first click sets the start, second click commits the end) — credited in the relevant file headers (MIT, Jasmin Noetzli).
• DatePicker — a trigger button that opens a Calendar inside a Popover. corvu has no dedicated date-picker primitive; this follows its own suggested composition of Calendar directly inside Popover, built on Kobalte's own pre-existing Popover/Calendar (not a corvu code port — credited for the pattern only). No segmented text input — the trigger shows the formatted value via DatePicker.Value.

Also included: Solid 2.0 rc.0 → rc.3 bump

solid-js/@solidjs/web/@solidjs/signals bumped to 2.0.0-rc.3, babel-preset-solid to 2.0.0-rc.2 (kept in lockstep across the catalog, overrides, and minimumReleaseAgeExclude entries in pnpm-workspace.yaml).

Shared-primitive fixes surfaced while building this

• button-root.tsx / popper-root.tsx: wrapped initial ref/placement signal reads in untrack() — Solid 2.0's stricter reactivity checks flagged these as untracked reads once exercised by the new components.
• spin-button-root.tsx: moved {...others} before the named event-handler props to fix a prop-override-order bug (DateField's segment component builds on SpinButton.Root).

Docs

• New .mdx pages for all three components (calendar.mdx, date-field.mdx, date-picker.mdx), matching the existing house style — anatomy, full prop/data-attribute tables, keyboard interaction tables, live previews.
• Changelog entries added to 2-0-x.mdx with accurate corvu/react-spectrum attribution.

Testing

• tsc --noEmit clean, biome check clean.
• Full suite passing (596 tests, including new calendar.test.tsx, create-calendar-state.test.ts, date-field.test.tsx, date-picker.test.tsx).
• Manual Storybook smoke test of all three components, including click-only range selection and the disabled-state visual treatment.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​solidjs/​web@​2.0.0-rc.0 ⏵ 2.0.0-rc.3	+3		+1	+1
	solid-js@​2.0.0-rc.0 ⏵ 2.0.0-rc.3	+1		+1	+1
	@​solidjs/​signals@​2.0.0-rc.0 ⏵ 2.0.0-rc.3	+5		+1	+1

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[jer3m01]

Few things to change, will pull the branch to test again after these.