BUG-003 — Email without a top-level domain passes validation

Priority: Medium
Severity: Major
Environment: Chrome 128, desktop
Steps to reproduce:
1. Open the registration form
2. Fill in all fields with valid data
3. Enter user@mail in the "Email" field (no .com, .net, etc.)
4. Click "Create account"
Expected result: The form shows the error "Please enter a valid email address"
Actual result: The form accepts the address as valid; registration succeeds
Notes: The regular expression only checks for the presence of @, but does not check for a top-level domain (a dot after @)