Fix Across Predict withdraw gas payment edges

[pedronfigueiredo]

Summary

This is PR 4 of 4 in the core stack for Predict withdraws over Across.

• Fixes TransactionController gas-fee-token publishing when native token usage is explicitly excluded.
• Handles Across gas-station edge cases for post-quote Predict withdraws, including source-token gas pricing fallback when the gas station cannot price the token directly.
• Caps prefunded post-quote Predict withdraw gas estimates at the configured Across fallback when batch simulation inflates the estimate.
• Keeps transaction-pay-controller coverage at 100% and exercises the transaction-controller gas-fee-token path.

Stack

1. Add Across Predict withdraw plumbing #8759: plumbing to identify Predict Across withdraws
2. Add Across Predict withdraw quote support #8760: quote support
3. Add Across Predict withdraw submit support #8761: submit support
4. This PR: gas payment edge cases

Validation

• yarn workspace @metamask/transaction-pay-controller run jest --no-coverage src/strategy/across/across-quotes.test.ts src/strategy/across/across-submit.test.ts src/strategy/across/AcrossStrategy.test.ts
• yarn workspace @metamask/transaction-controller run jest --no-coverage src/utils/gas-fee-tokens.test.ts
• yarn changelog:validate
• yarn workspace @metamask/transaction-pay-controller run test
• yarn workspace @metamask/transaction-controller run test

---

Note

Medium Risk
Touches gas-fee token selection and Across quote gas/fee calculations; mistakes could cause incorrect fee-token usage or failed submissions, but changes are localized and well-covered by new tests.

Overview
Fixes TransactionController pre-publish handling of selected gas fee tokens to respect excludeNativeTokenForFee (skip native-balance checks, force isExternalSign, and clear nonce) and adds coverage for this path.

Improves transaction-pay-controller Across post-quote Predict-withdraw quoting by capping inflated prefunded 7702 batch gas to the configured Across fallback, falling back to relaxed per-transaction estimates when batch simulation fails, and preferring source-token gas pricing for Predict-withdraws (including a fiat-rate-derived fallback when gas-station can’t price the source token). It also hardens gas-station token lookup when gas-fee-token estimation fails.

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