## Summary

This is PR 1 of 4 in the core stack for Predict withdraws over Across.

- Adds `TransactionType.predictAcrossWithdraw`.
- Treats `isPostQuote` requests as actionable for Across support checks.
- Allows source-chain authorization lists only for post-quote Predict
withdraw detection, where the original withdraw is not encoded as an
Across destination action.
- Generalizes transaction-pay refund documentation from Relay-only
language to quote-provider language.

## Stack

1. This PR: plumbing to identify Predict Across withdraws
2. MetaMask#8760: quote support
3. MetaMask#8761: submit support
4. MetaMask#8762: gas payment edge cases

## Validation

- `yarn workspace @metamask/transaction-pay-controller run jest
--no-coverage src/strategy/across/AcrossStrategy.test.ts`
- Full stack validation was run on the final stacked branch:
  - `yarn changelog:validate`
  - `yarn workspace @metamask/transaction-pay-controller run test`
  - `yarn workspace @metamask/transaction-controller run test`

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Changes Across quote eligibility logic to treat `isPostQuote` requests
as actionable and to allow EIP-7702 `authorizationList` only for a
specific Predict-withdraw post-quote path; misclassification could
incorrectly enable/disable Across quoting for some transactions.
> 
> **Overview**
> Introduces a new `TransactionType.predictAcrossWithdraw` to tag
Predict withdraws that will use Across.
> 
> Updates `AcrossStrategy.supports` to treat `isPostQuote` quote
requests as actionable and only accept them when the original
transaction is a Predict withdraw, plus adds
`hasUnsupportedTransactionAuthorizationList` to block EIP-7702
`authorizationList` usage except for the Predict-withdraw post-quote
detection case. Tests were extended to cover post-quote Predict withdraw
handling.
> 
> Minor docs/logic tweaks: `isAcrossQuoteRequest` now includes
`isPostQuote`, and `refundTo` comments were generalized from
Relay-specific wording to quote-provider wording.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
fc6f92e. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

## Summary

This is PR 2 of 4 in the core stack for Predict withdraws over Across.

- Adds Across quote construction for post-quote Predict withdraws.
- Uses exact-input quotes without destination actions for the post-quote
withdraw flow.
- Preserves provider fees, target totals, and original transaction gas
when normalizing quotes.
- Re-quotes post-quote withdraws after reserving source token for
source-chain gas paid with the source token.

## Stack

1. MetaMask#8759: plumbing to identify Predict Across withdraws
2. This PR: quote support
3. MetaMask#8761: submit support
4. MetaMask#8762: 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/AcrossStrategy.test.ts`
- Full stack validation was run on the final stacked branch:
  - `yarn changelog:validate`
  - `yarn workspace @metamask/transaction-pay-controller run test`
  - `yarn workspace @metamask/transaction-controller run test`

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Medium risk because it changes Across quote construction and gas/fee
calculations for post-quote Predict withdraw flows, including
special-casing EIP-7702 authorization-list handling and multi-phase
re-quoting logic that could affect pricing and execution safety.
> 
> **Overview**
> Adds Across **quote support for post-quote Predict withdraws**,
switching these requests to `exactInput` quoting with **no destination
actions** and passing `refundAddress` through to the Across
`/swap/approval` request.
> 
> Updates gas/fee normalization to **include the original withdrawal
transaction’s gas** in `sourceNetwork`/`gasLimits` for post-quote
quotes, and extends the existing two-phase “reserve source token for
gas-fee-token” re-quote flow to *also* apply to post-quote Predict
withdraws (now failing hard on unsafe/invalid phase-2 outcomes instead
of falling back).
> 
> Relaxes Across strategy quote support checks to allow first-time
EIP-7702 `requiresAuthorizationList` **only** for post-quote Predict
withdraw quotes that have no embedded Across actions, and updates
types/tests accordingly (including persisting `actions` in the quote’s
`original.request`).
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
a65c549. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->