docs: replace code-only Tabs with CodeGroup

[restorenode]

• Convert code-only tab sets to CodeGroup.
• Preserve non-code tab layouts.
• Use explicit CodeBlock children instead of raw fenced blocks inside CodeGroup.
• Improve consistency and reduce formatting churn from prettier.

[mintlify]

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Project	Status	Preview	Updated (UTC)
initia-docs	🟢 Ready	View Preview	Mar 30, 2026, 6:57 AM

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/update-tabs-to-code-group

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