feat(app): audit Remix beta 5 adoption

[kentcdodds]

Summary

• document repository-specific Remix v3 Beta 5 adoption opportunities
• split the web UI into explicit development and production start commands
• handle SIGINT and SIGTERM by closing the Bun server before exit

Key audit conclusions

• the repository is already on remix@3.0.0-beta.5
• trustProxy is not applicable to the current local Bun.serve() topology
• first-party button, input, and select adoption should follow an app-level theme decision to preserve dark mode and existing control tones
• fingerprinted browser assets are needed before immutable production caching is safe

Testing

• bun run typecheck
• bun test ./src/app-server.test.ts
• bun run validate
• bun run test:smoke
• manually started bun run app:start, fetched /, and verified SIGINT shutdown

  

[github-actions]

🎉 This PR is included in version 1.16.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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