- Hub sends full snapshot (type=snapshot) on new client connect before adding
to broadcast list, preventing race with delta messages
- tickDelta at 10 Hz computes byte-level diffs of cached JSON fields, broadcasts
only changed fields with no type field
- Dashboard sets awaitingSnapshot on WS open, drops incremental updates until
snapshot received, rebuilds full state from snapshot
- Fix zone snapshot building (nil→ok check, SizeX fields)
- Remove unused broadcastBLEScan function
- Add drainSnapshot helper and fix TestHub_LinkEvents to account for snapshot
- Add TestHub_SnapshotOnConnect, TestHub_SnapshotBeforeDelta, TestHub_DeltaOmitsTypeField
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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