fix(stellar): update ProfileModal registration

[chigozirim007]

PR: Update ProfileModal Registration for Stellar Wallets

Summary

This PR updates the ProfileModal registration flow to use the Stellar wallet context instead of StarkNet. The registration payload and storage now persist the Stellar public key (G...), aligning with the current wallet migration.

Changes

• Switched ProfileModal to use useStellarWallet() and publicKey for registration.
• Registration payload now sends the Stellar public key as wallet.
• localStorage and sessionStorage now persist the Stellar public key after successful registration.

Files Changed

• components/explore/ProfileModal.tsx

Issue

• Closes Update ProfileModal registration flow for Stellar #237

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