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EVM nonces assigned at txp creation time go stale when proposals sit waiting for signing. Add an opt-in deferNonce boolean so callers can signal that nonce assignment should happen later. Field added to ITxProposal interface, TxProposal class, create(), and fromObj() for persistence round-tripping.
When deferNonce is true, skip the getTransactionCount call during createTx and pass the flag through to TxProposal.create() so it persists on the proposal object.
Allow deferred-nonce txps to be published and re-published. Use prePublishRaw to store the original unsigned tx so proposal signature verification still works after nonce is assigned later.
Deferred-nonce proposals have nonce=null until assignNonce is called. Without null guards, the nonce comparison would coerce null to 0 and falsely trigger TX_NONCE_CONFLICT.
New endpoint lets the client request a fresh nonce just before signing. The handler fetches the confirmed nonce from the blockchain, skips past any pending proposal nonces in the database, and stores the gap-free result on the txp. Runs under _runLocked to prevent concurrent calls from receiving the same nonce for the same wallet.
Calls POST /v1/txproposals/{id}/assign-nonce/ so the app can
request a fresh nonce from BWS just before signing a
deferred-nonce transaction proposal.
Cover the full lifecycle: createTx with deferNonce, publishTx with prePublishRaw, assignNonce with gap-free calculation, signTx without false nonce conflicts, and broadcast. Includes a bulk-sign scenario that assigns sequential nonces to three deferred proposals signed one after another.
The repeated isRepublishEnabled() || deferNonce pattern in publishTx exists because both Solana blockhash refresh and EVM deferred nonce share the same need: preserve prePublishRaw for signature verification after the raw tx changes. Also remove unnecessary spread-copy before sorting pendingNonces in assignNonce since filter/map already produces a new array.
Consolidate into the existing integration test file rather than maintaining a separate file for one feature. Tests are placed under a new #assignNonce describe block between #signTx and #broadcastTx to match the transaction lifecycle order.
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