Replace JS navHeight measurement with CSS var(--header-height) so the fixed
panel renders in its final position on first paint — no onMount shift.
Add autofocus prop to WhoWhenSection (default true, preserves document-edit
behaviour) and pass autofocus={false} from BulkDocumentEditLayout so the date
field does not steal focus before the user has even dropped any files.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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