A near-complete overhaul of signup and first-run:
- Sign up with GitHub or Google in addition to email and password.
- The onboarding wizard now connects GitHub and lets you select a repo as part of the flow, so PR testing works on day one.
- Closing the GitHub OAuth popup midway no longer leaves the wizard stuck on a loading state.
- Vercel password-protected deployments are detected automatically. Instead of failing with a generic error, you get clear bypass instructions.
- A cleaner, less playful visual treatment that fits the engineering audience better.