chore(runway): cherry-pick fix: cp-8.0.0 require EIP-7702 for sponsored gas transactions

[runway-github]

• fix: cp-8.0.0 require EIP-7702 for sponsored gas transactions (fix: cp-8.0.0 require EIP-7702 for sponsored gas transactions #32253)

Description

Sponsored and gas-included transaction publishing depends on the
EIP-7702 delegation relay path. Previously, when atomic EIP-7702 support
was unavailable for the selected chain, the delegation publish hook
returned an empty result, which allowed the publish pipeline to continue
to later publication paths.

This PR makes that path fail closed for sponsored and gas-included
transactions by throwing a clear error when the chain does not support
EIP-7702 atomic batching. Non-sponsored transactions keep the existing
empty-result behavior when EIP-7702 is unavailable.

Changelog

CHANGELOG entry: Fixed sponsored and gas-included transactions falling
back when EIP-7702 support is unavailable

Related issues

Refs: MetaMask/core#9240

Manual testing steps

N/A - covered by unit tests for the transaction publish hook.

Screenshots/Recordings

N/A

Before

N/A

After

N/A

Pre-merge author checklist

• I've followed MetaMask Contributor
  Docs and MetaMask Mobile
  Coding
  Standards.
• I've completed the PR template to the best of my ability
• I've included tests if applicable
• I've documented my code using JSDoc format
  if applicable
• I've applied the right labels on the PR (see labeling
  guidelines).
  Not required for external contributors.

Performance checks (if applicable)

• I've tested on Android
  • Ideally on a mid-range device; emulator is acceptable
• I've tested with a power user scenario
• Use these power-user
  SRPs
  to import wallets with many accounts and tokens
• I've instrumented key operations with Sentry traces for production
  performance metrics
• See trace() for usage and
  addToken
  for an example

For performance guidelines and tooling, see the Performance
Guide.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the
  app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described
  in the ticket it closes and includes the necessary testing evidence such
  as recordings and or screenshots.

---

Note

Medium Risk
Changes transaction publish behavior for gas-sponsored and
gas-included flows on chains without EIP-7702, blocking unsafe fallbacks
instead of silently continuing.

Overview
Sponsored and gas-included publishes must use the EIP-7702
delegation relay. When atomic batch support is missing for the chain,
Delegation7702PublishHook used to return an empty result so later
publish hooks could run.

This change throws for isGasFeeSponsored or isGasFeeIncluded
when the chain is not EIP-7702-capable, with a clear error (prefixed as
Gas Station 7702:). Regular transactions still get the empty result
and can fall through.

Gas flags are normalized earlier (Boolean on isGasFeeIncluded /
isGasFeeSponsored) and includeTransfer now keys off the same
isSponsored flag. Unit tests cover sponsored and gas-included cases
when atomic batch is unsupported.

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[48adf87](https://github.com/MetaMask/metamask-mobile/commit/48adf87a68825ffbc76be9f2db2c8e4afec9708a)

[github-actions]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud