- Add dedicated job for building Node.js server
- Use Node 20 on Ubuntu for the server build
- Run npm ci, build, and tests for the web directory
- Upload dist/ folder as build artifacts
The serverPort was being stored as a String in SettingsView but read as an
integer in VibeTunnelApp, causing it to default to 0 and then 800. Fixed by
reading it as a String and converting to Int with proper fallback to 4020.