feat(transaction-pay-controller): subsidized submit#9298
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…lay/subsidize Subsidized Relay quotes (non-zero fees.subsidized.amountUsd) now bypass /execute and submit through the intents-API POST /relay/subsidize endpoint instead. The client signs two ERC20BalanceChange + LimitedCalls delegations server-side; the server JIT-fetches a fresh Relay quote, pairs each delegation with a step, builds redeemDelegations calldata, and submits to Relay — returning a new request ID for status polling. Key changes: - utils/delegation.ts: buildAndSignSubsidizedDelegation with ERC20BalanceChange and LimitedCalls caveats, ANY_BENEFICIARY delegate, 20% amount buffer - relay-api.ts: submitRelaySubsidize() calling POST /relay/subsidize - relay-submit.ts: submitViaRelaySubsidize signs 2 delegations in parallel and sends delegations:[ctx0,ctx1] matching server schema; isSubsidizedRelayQuote detects subsidized quotes from fees.subsidized.amountUsd - types.ts: RelaySubsidizeRequest / RelaySubsidizeResponse - feature-flags.ts: relaySubsidizeUrl flag with DEFAULT_RELAY_SUBSIDIZE_URL default; fix localhost hardcoded URLs for relayQuoteUrl and relaySubsidizeUrl Fix crash when subsidized preview quotes have steps: undefined — server toSafeSubsidizedQuote() strips steps entirely; submitTransactions now uses quote.original.steps ?? [] and submitViaRelaySubsidize initialises quote.original.steps ??= [] before element access.
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