Added Sonic network logo (sonic.svg)

[b1rdmania]

Description

This PR adds the Sonic network logo (sonic.svg) to the MetaMask extension's images directory. This logo will be used to represent the Sonic network in the MetaMask UI when the network configuration is added in a future PR.

The addition of this logo is a preparatory step for full Sonic network integration, allowing users to visually identify the Sonic network in the MetaMask interface.

Related issues

Fixes: N/A - This is a preparatory PR for Sonic network integration

Manual testing steps

1. Navigate to app/images directory
2. Verify that sonic.svg is present
3. Verify that the SVG file loads correctly and is not corrupted

Screenshots/Recordings

Before

N/A - New asset addition

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension 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.

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.

[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.

[b1rdmania]

I have read the CLA Document and I hereby sign the CLA