feat(preview-server): isolated development workflow

[gabrielmfern]

This implements two scripts for doing dev work on the preview server that is completely separate from the CLI. The first script creates an emails directory that is not committed with a simple repeated file structure. The idea is to be able to only work in the preview server with the most simple way.

The seed command doesn't currently generate anything at random right now because I don't know exactly how we would generate emails in a meaningful way here.

The other script actually runs next dev and creates an .env.local with values imitating what the CLI would give the preview server for things to work properly. This needs to be a script because we need to delete the env file after next dev closes. If we don't, the file can interfere with subsequent builds of the preview server.

Testing

1. cd into packages/preview-server
2. run pnpm seed
3. run pnpm turbo dev
4. go to http://localhost:3000

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Name	Status	Preview	Comments	Updated (UTC)
react-email	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 16, 2025 2:48pm
react-email-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 16, 2025 2:48pm

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commit: 416399c