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perf(web): reconcile moves every connected node with moveBefore() (#4774)

* perf(web): reconcile moves every connected node with moveBefore()

Every connected node now moves with Element.moveBefore() where the browser
has it, and the replaceChild path inserts instead, as Octane does. dbmon's
1,000-row sort drops from ~2.0 ms to ~0.75 ms (level with Octane 0.16.7);
shuffle and reverse 3-7% faster; nothing else past noise. The per-pass
document.activeElement read goes away, since focus now survives without it.
Journal §20.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(web): type the moveBefore spec's includes() checks as Node[]

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWMR7ndYUnqBW5NjTbC

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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