refactor(emerald): extend v0 prop interfaces across the library

[johnleider]

The extends-sweep: 56 of Emerald's 74 hand-written Em*Props interfaces now extend v0's exported prop types — Omit<XRootProps, 'as' | 'renderless'> for the 27 full mirrors (tracking v0), explicit Pick<> key lists for the curated subsets (frozen surface), own-fields for DS-specific props. The 18 without a v0 counterpart (EmCalendar family, EmKanban, and the seven Atom-based presentational components) are unchanged.

Consumer-facing fixes (the drift this closes)

• rules on EmTextField/EmTextarea accepts rule aliases and Standard Schema validators (inherits InputRootProps['rules']).
• disabled/readonly/indeterminate accept refs and getters (MaybeRefOrGetter) wherever v0 declares them — and the seven data-disabled/data-readonly truthy-test sites now resolve through toValue(), fixing styling that would have latched permanently on a ref input.
• Hand-typed unions replaced with v0's exports (EmTabsOrientation = TabsOrientation; EmSliderOrientation = NonNullable<SliderRootProps['orientation']>).

Surface proof

Runtime prop surface diffed from the built bundle across all 90 components at every phase: identical — zero props added, removed, or renamed. The seven toValue wraps are the only non-declaration lines in the 57-file diff. Emerald + dev-app typecheck, emerald build, lint, and the full non-browser suite (4869) all green.

Notes for review

• as/renderless are deliberately excluded from every mirror: Emerald never forwards them, and inheriting them would have added lying props to 27 surfaces (the SFC compiler treats unresolved extends members as fallthrough attrs — discovered the hard way: Omit<X, keyof AtomProps> typechecks but breaks the build; literal key unions resolve).
• Emerald-specific JSDoc that inheritance erased is restored via indexed-access own-fields (label?: InputRootProps['label']), keeping the drift pin.
• A11y gap documented, not fixed (out of scope for a type sweep): EmSnackbar withholds v0's urgent, so every snackbar — including variant="error" — announces as role="status"/polite. Follow-up issue filed.
• Process note: typecheck alone is insufficient for this class of change — the SFC build and the runtime-props diff each caught a failure typecheck passed.