perf(email): Upgrade react email to 6

[aXenDeveloper]

Improving Documentation

• Run pnpm lint:fix to fix formatting issues before opening the PR.
• Read the Docs Contribution Guide: https://vitnode.com/docs/dev/contribution

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Project	Deployment	Actions	Updated (UTC)
vitnode-docs	Ready	Preview, Comment	Jul 4, 2026 6:17pm

[gemini-code-assist]

Code Review

This pull request migrates email-related dependencies from @react-email/components to react-email and @react-email/ui, and replaces use-intl with next-intl across the codebase. It also refactors the file utility script to export cleanupDeletedFiles and adds comprehensive unit tests for it. Feedback on the changes includes a potential cross-platform path-matching bug on Windows in cleanupDeletedFiles due to unnormalized path separators, and a broken documentation URL for next-intl in templates.mdx.

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