Add linked sign-in methods in Settings with connect/unlink rules.

[ummaraali2]

Users can view Google, GitHub, ORCID, and email/password connections, link new providers, and only disconnect when another sign-in method remains.

Summary

• Settings section to view and manage sign-in methods (email/password, Google, GitHub, ORCID)
• Connect/unlink with safeguard: at least one method must remain
• OAuth link flow from Settings; OAuth callback double-exchange fix

Test plan

• Open Settings → Sign-in methods; confirm current providers show as Connected
• Connect Google/GitHub/ORCID from Settings; confirm redirect back with success notice
• Try disconnecting your only method — should be blocked with "Required"
• With two methods linked, disconnect one — should succeed
• OAuth-only user with email: set password from Settings, then sign in with email
• GitHub/Google sign-in still works (no false error after success)

[vercel]

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Project	Deployment	Actions	Updated (UTC)
postscholar	Ready	Preview, Comment	Jun 13, 2026 12:12am