Solana tutorial update

[fadeev]

Related: zeta-chain/example-contracts#287

[vercel]

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Project	Deployment	Preview	Updated (UTC)
docs-v2	Ready	Preview	Nov 3, 2025 1:19pm

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch solana-tutorial-udpate

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