feat: Change WalletButton alignment from start to center

[marcinciarka]

WalletConnect button and the More wallets button are aligned to the center. It looks weird when external/injected wallets are aligned to the left.

• Changed the className in the WalletButton component to use justify-center instead of justify-start, centering the button's content.

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PR-Codex overview

This PR focuses on updating the alignment of buttons in two components to improve their appearance. The alignment changes from justify-start to justify-center, which centers the buttons within their container.

Detailed summary

• In WalletButton.tsx, the className property changes from justify-start to justify-center.
• In SolanaWalletButton.tsx, the className property also changes from justify-start to justify-center.

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[Copilot]

Pull request overview

This PR aligns the content of the WalletButton component (used for external/injected EVM wallets) to center, matching the existing alignment of WalletConnectButton and the "More wallets" button. Previously, WalletButton used justify-start which caused a visual inconsistency when these buttons appeared in the same wallet selection list.

Changes:

• Changed the Tailwind class on the WalletButton component from justify-start to justify-center to center-align its content.

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