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Phase 1 Better Auth stabilization: - Upgrade better-auth to ^1.5.6 in apps/web (matches api) - Switch OAuth state to cookie storage (BA v1.5+ requirement) - Remove manual redirectURI overrides - Exclude /api/auth/* from service worker caching - Add 503 error handling when auth not configured - Display login errors inline on login page - Update infra submodule with social auth env vars Closes GRO-563 Co-Authored-By: Paperclip <noreply@paperclip.ing>