Update playground pages

[joaquim-verges]

PR-Codex overview

The focus of this PR is to update UI components and integrate wallet functionalities in the playground-web app.

Detailed summary

• Updated UI components in Header.tsx, styled-pay-embed.tsx, styled-connect-embed.tsx, page.tsx.
• Integrated wallet functionalities in hooks.tsx, connect-smart-account.tsx, connect-smart-account-custom.tsx, sponsored-tx.tsx.
• Modified constants and addresses in various files.

The following files were skipped due to too many changes: apps/playground-web/src/components/in-app-wallet/sponsored-tx.tsx, apps/playground-web/src/app/connect/in-app-wallet/page.tsx, apps/playground-web/src/app/connect/account-abstraction/page.tsx, apps/playground-web/src/app/connect/pay/page.tsx, apps/playground-web/src/app/connect/sign-in/page.tsx

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Name	Status	Preview	Comments	Updated (UTC)
thirdweb_playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 4, 2024 8:33am

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