Third inconsistent logo cyan swirl svg search bar

[Bigmehelen]

closed #252

Summary

This PR implements GitHub OAuth account linking functionality and refines the workspace header layout.

Backend

• Added GitHubAccount struct and github_account field to the User model in backend/api/src/model/user.rs
• Added update_user_github_account method to AuthService in backend/api/src/services/auth_service.rs
• Updated github_callback handler in backend/api/src/api/handlers/auth_handler.rs to link GitHub accounts after first OAuth authentication
• Added github_unlink endpoint in auth_handler.rs to allow users to disconnect their GitHub account
• Registered the github_unlink route in backend/api/src/api/routers/auth_router.rs

Frontend

• Added "Unlink GitHub" button in frontend/src/features/ProfilePage.tsx under the GitHub connection field
• Added account linking section in frontend/src/features/SignInPage.tsx for GitHub OAuth flow
• Added account linking section in frontend/src/features/GetStartedPage.tsx for GitHub OAuth flow
• Streamlined the workspace header in frontend/src/components/Layout.tsx to reduce dead space:
  • Reduced header padding and gaps for a tighter layout
  • Made the search bar more compact (w-48 instead of w-64)
  • Reduced logo and icon sizes for better visual balance
  • Narrowed the network selector dropdown

Key Changes

File	Change
backend/api/src/model/user.rs	Added GitHubAccount struct and github_account field
backend/api/src/services/auth_service.rs	Added update_user_github_account method
backend/api/src/api/handlers/auth_handler.rs	Added GitHub account linking in callback and github_unlink handler
backend/api/src/api/routers/auth_router.rs	Registered /auth/github/unlink POST route
frontend/src/features/ProfilePage.tsx	Added Unlink GitHub button and connection UI
frontend/src/components/Layout.tsx	Streamlined header spacing and sizing

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