InsufficientDustException

Thrown when a balance can't proceed because the wallet has no spendable dust — specifically, every dust UTXO in the synced state is one the wallet already spent but whose spend the indexer's event stream hasn't reflected yet (so it's correctly excluded to avoid node error 115).

This is a clean, actionable failure: the dust is genuinely tied up awaiting reconfirmation, so retrying immediately or forcing a full re-sync won't help — the caller should surface "waiting for dust to reconfirm" and retry later.