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feat(DateInput)!: carry the time through a type option, drop DateTimeInput (#1362)

A date and time field was a class of its own for three reasons: which sections
the locale-derived layout carries, a `seconds` flag and a different default
`aria-label`. All three are configuration, so `DateInput` takes `type: 'date' |
'datetime'` and `seconds`, and `DateTimeInput` is gone. `DateRangeInput` and
`DateTimePicker` pass the two options on, so a range that carries time is two
attributes on the range container and needs no component of its own.

The range needed two fixes to make that true. It declares `type` and `seconds`
so they are type-checked, documented and forwarded by the picker as well, and
it compares the two ends by instant rather than by calendar day: `isSameDateAs`
looks at year, month and day only, so moving an hour changed `getStartDate()`
and emitted neither `startDateChange` nor `rangeChange`. `isSameInstantAs` is
the comparison the section field already used for the same job.

Parsing a datetime value is now two passes: the locale's own date-time patterns
first, then the date-only path. Measured in Chromium across five locales and
seven value shapes against the previous build, five cases move from unparsed to
parsed (`2026/07/14 14:30` everywhere, `14/07/2026, 14:30:00` in en-GB/pl-PL/
de-DE), five move from the local offset to midnight (a bare `2026-07-14` used
to go through `new Date`, which reads it as UTC), and none regress.

The accessible name is resolved per type when it is written rather than folded
into the config, so `setConfig({ type: 'date' })` announces a date field again
and a label the page wrote survives.

4067 specs pass; the datetime cases move into the date input suite, with new
ones for the locale format, the label round trip and the range's time-only edit.

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