feat: add 0G network icon and native-asset icon

[maxime-oe]

Wires 0G (16661/0x4115) into NETWORK_CHAIN_ID and
CustomNetworkImgMapping (network-picker icon) -- not the PopularList additional-network entry, which stays out of scope per the standing additional-network-is-optional ruling (same treatment as Somnia).

Also wires app/images/image-icons.js's imageIcons map, keyed by ticker symbol ('0G'), since the native-asset row in the wallet's asset list resolves its icon via NetworkAssetLogo -> Base/TokenIcon through that map, not through CustomNetworkImgMapping.

Description

Changelog

CHANGELOG entry: add 0G network icon and native-asset icon

Related issues

Fixes:

Manual testing steps

Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]

Screenshots/Recordings

Before

After

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

Low Risk
Display-only asset and mapping additions with no RPC, auth, or transaction logic changes.

Overview
Adds 0G (chain 0x4115 / 16661) to the custom-network icon plumbing so the network picker and wallet UI can show branded artwork when users are on that chain.

NETWORK_CHAIN_ID gains ZERO_G, and CustomNetworkImgMapping points it at 0g-mainnet-logo.png. Separately, image-icons.js maps the native ticker '0G' to 0g-native-logo.png so the asset list resolves the native token logo via NetworkAssetLogo / TokenIcon, not the chain-id mapping.

PopularList is unchanged (same optional treatment as Somnia).

^{Reviewed by Cursor Bugbot for commit 10a2368. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[metamask-ci]

PR template — items to address before "Ready for review"

Warnings — informational, address before merging:

• Description section is empty. Describe what changed and why.
• Related issues section is empty. Add Fixes: #123 / Closes: <URL> / Refs: <Jira key>, or write a short rationale after the colon.
• Manual testing steps still contain template content (the Gherkin example title or a [...] placeholder). Replace with real steps, or write N/A — <reason>.
• Pre-merge author checklist has unchecked items (e.g. "I've followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards."). Every box must be consciously checked — see docs/readme/ready-for-review.md.

See docs/readme/ready-for-review.md for the full Definition of Ready for Review.

[github-actions]

🔍 Smart E2E Test Selection

• Selected E2E tags: SmokeNetworkAbstractions
• Selected Performance tags: None (no tests recommended)
• Risk Level: low
• AI Confidence: 90%

click to see 🤖 AI reasoning details

E2E Test Selection:
The PR adds support for the 0G Mainnet network (chain ID 0x4115) by:

1. Adding two new PNG image assets (mainnet logo and native token logo)
2. Registering the native token icon in image-icons.js
3. Adding ZERO_G chain ID to NETWORK_CHAIN_ID constant and mapping it to the logo in CustomNetworkImgMapping in customNetworks.tsx

These are purely additive, non-breaking changes. No controller logic, transaction flows, Engine, or critical paths are modified. The changes affect the network management layer (adding a new custom network entry) and asset display (network badge/token icon). SmokeNetworkAbstractions covers network management UI including adding networks and viewing available networks, which is the most relevant test suite for validating this change. No dependent tags are required since this doesn't touch dApp chain permissions, multi-chain sessions, or transaction confirmations.

Performance Test Selection:
The changes are purely additive — new image assets and a new chain ID entry in a static mapping. There is no impact on app launch time, account list rendering, login performance, swap flows, or any other performance-sensitive path. No performance tests are warranted.

View GitHub Actions results

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud