docs: updates react native docs to use createModularAccountV2Client

[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)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

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PR-Codex overview

This PR focuses on updating the account client creation from createLightAccountClient to createModularAccountV2Client in various components, reflecting a shift to a newer modular account structure.

Detailed summary

• Replaced createLightAccountClient with createModularAccountV2Client in multiple files.
• Updated references from LightAccount to ModularAccountV2.
• Adjusted documentation to reflect the new client and account type.

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 25, 2025 0:41am
aa-sdk-ui-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 25, 2025 0:41am