Ark sync: anti-entropy so a device can't clobber another's coins

All devices share one replaceable-event slot (same seed -> same nostr
key), so a device that published its snapshot before merging in
another device's ark state wiped those coins from the slot — exactly
what stranded a phone showing no ark balance. Fix: on receiving any
snapshot, union it with local and, if we hold vtxos the snapshot
lacked, re-publish the superset. The slot converges to the union
regardless of publish order; the guard (mergedN>remoteN) stops the
push-back once every device agrees, so no loop.

Co-Authored-By: Claude Fable 5 <[email protected]>

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