Add Across Predict withdraw support

[pedronfigueiredo]

What changed

Adds Across support for post-quote Predict withdraw flows on top of the gasless Across branch.

• Adds predictAcrossWithdraw as a transaction type.
• Allows Across post-quote requests only for Predict withdraw transactions.
• Builds post-quote Across quotes as exact-input bridge quotes with no destination actions, passes refundAddress, and includes the original Predict withdraw gas in quote gas accounting.
• Applies gas station handling to Across post-quote flows when native balance is insufficient.
• Prepends the original Predict withdraw transaction before the Across approval/swap transactions during submission, including batch gas-limit alignment and predictAcrossWithdraw typing for the Across leg.

Why

Predict withdraw source funds originate from the Predict proxy/Safe and only become available after the original withdraw transaction executes. Across needs the same post-quote structure as the Relay flow: execute the original withdrawal first, then execute the quote leg, with refunds routed back to the proxy when provided.