This PR implements proper logging and error handling for the Google OAuth callback as requested in issue #3.
### Changes:
- Added `ILogger<Program>` to the Google callback endpoint.
- Logged warning if external login info is null.
- Logged error details from `userManager.CreateAsync` if provisioning fails.
- Introduced specific error codes `UserAlreadyExists` and `LockedOut` to improve UX.
- Updated `Login.razor` to display descriptive Polish error messages based on the query parameter.
Fixes#3
Reviewed-on: #18
Co-authored-by: Marek Jasiński <jasins.marek@gmail.com>
Co-committed-by: Marek Jasiński <jasins.marek@gmail.com>
mjasin
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