Refactor object-detail.tsx to resolve term/authority ids to labels via
FlexibleFieldValue, group flexible fields by def.group in definition order
(ungrouped → trailing "Other"), always show core fields with "—" placeholders,
and move Edit (button-styled Link) + Delete into a right-aligned toolbar.
Move formatDate into lib/format-date.ts so the component module no longer
co-exports a non-component (clears the react-refresh/only-export-components
warning); both flexible-field-value.tsx and object-detail.tsx import it.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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