BUG: Missing validation for unclosed angle bracket in parseEmailAddress

[andrinoff]

Describe the bug

In parseEmailAddress() (main.go:2087-2099), when a < is found but no closing >, the function extracts everything from < to end of string as the email address. This returns malformed email addresses.

To reproduce

1. Input an email address like User Name <user@example.com (no closing bracket)
2. The parsed email will include trailing garbage

Expected behavior

If no closing > is found after <, the function should return an error or fallback to treating the whole string as a plain address.

[floatpanebot]

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