fix(vercel): add preview command

[pi0]

This PR adds a preview command for vercel preset.

(hot) fixes #3905 as tanstack start now having hard requirment of vite preview server for prerendering.

[vercel]

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Project	Deployment	Review	Updated (UTC)
nitro.build	Ready	Preview, Comment	Jan 5, 2026 3:41pm

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

The Vercel preset's preview command value in commands object is updated from an empty string to "npx srvx --static ../../static ./functions/__server.func/index.mjs", enabling the preview deployment step to serve static files and the server function.

Changes

Cohort / File(s)	Summary
Vercel preset command configuration src/presets/vercel/preset.ts	Updated commands.preview from empty string to "npx srvx --static ../../static ./functions/__server.func/index.mjs" to enable preview command functionality

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/vercel-preview-command

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📜 Recent review details

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between df7fd85 and 064423f.

📒 Files selected for processing (1)

• src/presets/vercel/preset.ts

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