docs: adds using 7702 react page

[linnall]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
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PR-Codex overview

This PR adds a new section on EIP-7702 to the React documentation, detailing its features, benefits, and implementation for developers. It also updates the sidebar to include a link to this new content.

Detailed summary

• Updated site/sidebar/react.ts to add a link for "Using 7702".
• Created site/pages/react/using-7702.mdx with:
  • Title and description for EIP-7702.
  • Explanation of EIP-7702 and its significance.
  • Use cases for developers with existing users and those not yet deployed.
  • Instructions for shipping smart EOAs.
  • Information on when EIP-7702 will be available.
  • Guidance on upgrading existing EOAs.

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	❌ Failed (Inspect)			Feb 12, 2025 5:13pm
aa-sdk-ui-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 12, 2025 5:13pm

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[limawebdev1]

Flagging that i'm seeing a weird typo here in "7702-uypgrade" - let's double check that this links correctly