Adds the edit-form date-precision controls to WhoWhenSection: a labelled
precision <select> (min 48px touch target for senior authors), a conditionally
revealed end-date field (only for RANGE, announced via aria-live=polite), and
the verbatim raw cell as labelled read-only static text (not a disabled input).
Fields submit as metaDatePrecision/metaDateEnd/metaDateRaw and flow through the
existing PUT form action.
Backend: DocumentService.updateDocument now persists the three DTO fields (they
existed since #671 but were never applied), so the new controls are real, not
decorative — addresses Nora's "a client <select> constrains nothing" note for
the persistence half. Server-side enum/end>=start validation remains #671's
scope.
Refs #666
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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