- Update ErrorResponse model to make detail and statusCode optional since
backend now returns simple {"error": "message"} format
- Update AuthApi to parse actual backend error messages instead of generic
"Registration failed"/"Login failed" strings
- Update ErrorParser to prioritize the "error" field and add fallback for
simple error map responses
- Update iOS ViewModels (Login, Register, AppleSignIn) to properly handle
400 and 409 status codes by displaying backend error messages
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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