Vite's built-in server.open fired before portless was reachable and
used the wrong hardcoded URL, so yarn start opened a 404. Disable
vite's open when PORTLESS_URL is set and explicitly open the
branch-scoped URL from start-dev.js after HTTP 2xx/3xx readiness.
Adopt branch-aware Portless app naming with numeric suffixes for repeated worktree runs, add a shared direct-Vite port resolver for PORTLESS=0, and keep the Electron bypass pinned to PORT=3000 so existing localhost-based dev flows still work.
