Add banner to arbitrum sepolia testnet

[guilhermebins]

This enhancement adds the Arbitrum Sepolia testnet banner to be displayed when users are connected.

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[pikonha]

we really appreciate your contribution to this @guilhermebins ✨

although the issue mentions adding the banner for arbitrum sepolia, I'd advise relying on the viem's chain definition which included a testnet flag for each chain.

the condition would be like this then:

 const isConnectedToTestnet = () => chain?.testnet;

what do you think @eduramme?

[FrancoAguzzi]

@guilhermebins thank you, looks sharp 📐✨

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[FrancoAguzzi]

[guilhermebins]

@guilhermebins thank you, looks sharp 📐✨

Thank you for your support, and I am happy to contribute to the project :)