feat: synchronize CodeGroup tab selection across page and persist preference

[rogeriochaves]

Hey there, this is also another feature we are currently using on Scenario that I think should benefit other vocs user:

https://scenario.langwatch.ai/

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Adds state management to CodeGroup component to synchronize tab selection across all code groups on the same page and persist user preference to localStorage.

When a user selects a language tab (e.g., TypeScript, JavaScript), all other code groups on the page automatically switch to the same language, and the preference is saved. When the user returns to the documentation, their preferred language is automatically selected.

Key features:

• Synchronizes tab selection across all CodeGroup instances on the page
• Persists selection to localStorage for future visits
• Cross-tab synchronization using storage events
• Same-page synchronization using custom events
• Graceful error handling for SSR and private browsing mode
• Only switches to tabs that exist in each code group

This significantly improves UX for users who consistently prefer one language, eliminating the need to manually switch tabs on every code example.

It also allows listening to external components changing the global language, e.g. this select we have on top:

[vercel]

@rogeriochaves is attempting to deploy a commit to the Wevm Team on Vercel.

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