Fix incorrect copy-paste usage of isLoading and data.hash in useWriteContractSponsored example

[autumncrypto]

Fixed inconsistencies in the useWriteContractSponsored example in the README.

Replaced isLoading with isPending to match the behavior of mutations in TanStack Query v5. Updated transaction hash display from data?.hash to data, since the hook returns the transaction hash directly (not an object).

These changes align the documentation with the actual hook implementation and prevent confusion when integrating the example.

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PR-Codex overview

This PR focuses on updating the state management in the SponsoredContractWrite component, changing the loading state variable and adjusting the display of the transaction hash.

Detailed summary

• Replaced isLoading with isPending for button disabling and loading indication.
• Updated button text to reflect the new isPending state.
• Changed the transaction hash display from data?.hash to data.

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PR Summary

Low Risk
Low risk documentation-only change; updates the README example to match the hook’s actual mutation state (isPending) and return value (data as tx hash).

Overview
Fixes the useWriteContractSponsored README example to use isPending (instead of isLoading) for button disabling/loading copy, and to display the returned transaction hash directly from data (instead of data?.hash).

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