feat(onboarding): add maintainer queue settings panel (fixes #679)

[Diwakar-odds]

Summary

Adds the Queue Settings UI panel for the maintainer onboarding page, completing the second half of step 2.

Type of Change

• Bug fix
• New feature
• UI / UX improvement
• Refactor
• Documentation
• Other

Related Issue

Closes #679

What was changed?

• Created <QueueSettings /> client component to render the three core queue controls: Minimum Contributor Level, AI-Generated PR Detection, and Auto-Assign Mentor Chain.
• Integrated optimistic UI updates wrapping the existing maintainer server actions.
• Modified page.tsx in src/app/onboarding/repos to fetch getInstallationSettings and display both the RepoPicker and QueueSettings side-by-side using a responsive grid/flex layout.
• Removed max-w-2xl from the RepoPicker so it dynamically fits the two-column layout.

Screenshots

N/A

Checklist

• My code follows the project structure and conventions
• I tested this locally (npm run dev)
• No hardcoded secrets or credentials
• I have updated documentation if needed

[vercel]

@Diwakar-odds is attempting to deploy a commit to the codersogs-3057's projects Team on Vercel.

A member of the Team first needs to authorize it.

[Diwakar-odds]

Hi maintainers, could I please get a review on this PR?

ECSoC26 Label Request:
Based on the official ECSoC criteria, I believe this PR qualifies for Level 2 and good-ui.

• Level 2 Justification: This PR introduces a new user interface component (<QueueSettings />) for the maintainer onboarding flow, integrating it directly with existing backend server actions. It resolves the "two halves" design described in the issue.
• good-ui Justification: The implementation utilizes optimistic UI updates with React's useTransition hook to ensure a snappy user experience when toggling settings, and seamlessly integrates the new panel alongside the existing RepoPicker with a responsive two-column flex layout that matches the application's aesthetic.

Could you please add the ECSoC26, Level 2, and good-ui labels to this PR? Thank you!

[pavsoss]

@Diwakar-odds the CI check is failing

[Soumya-codr]

@Diwakar-odds the ci checks are failing are u still active to respond

[Diwakar-odds]

I have fixed the TypeScript error by casting the parsed integer to the expected literal type.

[Ayush4958]

@Diwakar-odds
could u add Screen recording of ur change,
it helps us to review it

thanks...