This commit introduces Vercel integration, enabling users to deploy projects directly to Vercel. It includes:
- New Vercel types and store for managing connections and stats.
- A VercelConnection component for managing Vercel account connections.
- A VercelDeploymentLink component for displaying deployment links.
- API routes for handling Vercel deployments.
- Updates to the HeaderActionButtons component to support Vercel deployment.
The integration allows users to connect their Vercel accounts, view project stats, and deploy projects with ease.
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