Refuse a copy onto an id that already shows another image

CodeRabbit's review: an active row under the target's id counted as the
copy whatever it showed. It now counts only if it has the source's
stored bytes; otherwise the copy is refused.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
f3922cb5c8Dara Adedeji committed on 10/10/2026, 4:42:28 PMparentf49e0c3

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