feat(docs): tabs can have a query param name

[coltondotio]

Short description of the changes made

tabs can have a query param name

Added paramName prop to TabGroup:

• When paramName is specified (e.g., paramName="tab"), the component syncs with the URL query parameter
• On initial load, if ?tab=someTabId is in the URL and matches a tab's id, that tab is selected
• When a tab is clicked, the URL is updated with ?tab=selectedTabId

Usage example:

Overview content... Installation content...

With ?tab=installation in the URL, the "Installation" tab will be automatically selected. When users click between tabs, the URL will update accordingly (using router.replace so it doesn't pollute browser history).

The feature is opt-in - tabs without paramName work exactly as before.

[vercel]

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Project	Deployment	Review	Updated (UTC)
dev.ferndocs.com	Ready	Preview	Dec 23, 2025 0:20am
fern-dashboard	Ready	Preview	Dec 23, 2025 0:20am
fern-dashboard-dev	Building	Preview	Dec 23, 2025 0:20am
prod-assets.ferndocs.com	Ready	Preview	Dec 23, 2025 0:20am
prod.ferndocs.com	Ready	Preview	Dec 23, 2025 0:20am

1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
fern-platform	Ignored		Dec 23, 2025 0:20am

[github-actions]

🌱 Smoke Test Preview

Run at: 2025-12-23 00:20:33 UTC

Testing branch changes with smoke test content:

• Smoke Test Content (from FDR): https://smoke-test-preview-f634417d-e4b0-475e-9e8b-f42fb85e2716.docs.buildwithfern.com
• Branch's Docs Platform (Vercel): https://prodferndocscom-git-cberry-tab-query-param-buildwithfern.vercel.app/api/fern-docs/preview?host=smoke-test-preview-f634417d-e4b0-475e-9e8b-f42fb85e2716.docs.buildwithfern.com

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