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Closes #11923 # Which Problems Are Solved Client-side gRPC errors (e.g. NotFound, InvalidArgument, PermissionDenied) were being surfaced as HTTP 500 Internal Server Errors, causing false SRE alerts and poor UI feedback. # How the Problems Are Solved - New transport interceptor (`error-classification.ts`): Automatically enriches every ConnectError with httpStatus and isUserError metadata via a `ClassifiedConnectError` wrapper - Route handler protection (`route.ts`, `flow-initiation.ts`): Catches classified errors from `getAuthRequest` / `getSAMLRequest` and returns correct HTTP status codes instead of 500 - Type safety: Replaced all magic number error.code === 9 checks with typed Code.FailedPrecondition + instanceof ConnectError across `oidc.ts`, `saml.ts`, `password.ts`, `zitadel.ts` - Classification-aware logging (`session.ts`): Client/user errors log at warn level, server errors at error level - Observability (`otel.ts`): Spans now include error.is_user_error and http.status_code attributes for alert filtering # Additional Changes Gitignore `next-env.d.ts`: This file is auto-generated by Next.js on every next dev and next build invocation. The two modes write slightly different import paths (.next/dev/types/ vs .next/types/), which causes git diff --exit-code to fail in CI whenever a developer runs next dev locally before committing. Since Next.js regenerates it automatically, there's no need to track it --------- Co-authored-by: Ramon <[email protected]> Co-authored-by: Copilot <[email protected]>