updateDocument now captures the machine title from the persisted state before any
setter runs, and rebuilds it from the new state only when the submitted title still
equals that machine value — an exact comparison that relies on the edit form
round-tripping an untouched title verbatim. A hand-written or freshly-typed title is
kept; a blank submission falls back to the rebuilt auto-title (title is always present);
a file-replaced document no longer matches its import-time title and is treated as
manual. projectedState mirrors the setter asymmetry exactly (date/location overwrite
incl. null-clear; precision/end/raw skip-null from the entity).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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