fix(auth): return consistent error response for invalid login #480
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Description
This pull request improves the authentication error handling during login by standardizing the response for invalid credentials. When a user provides an incorrect username or password, the API now returns a clear and consistent 401 (Unauthorized) response with a generic error message.
Fixes
Fixes inconsistent error handling for invalid login attempts where no clear feedback was provided to the client.
Checklist
Notes
Returning a 401 status for invalid credentials aligns with HTTP authentication semantics and allows frontend clients to reliably display user-friendly error messages without exposing sensitive authentication details.