[CS-1425] Handle email addresses with spaces in local part

[devin-ai-integration]

ixes handling of email addresses with a period followed by a space in the local part
(e.g., g. speel@example.com).

The Mail gem silently fails when parsing this specific pattern - it sets local to nil
without raising an error. This change adds validation to detect when the Mail gem can't
determine the local part and properly marks such addresses as exceptional.

What changed:

• Added validation in initialize to raise ArgumentError when @mail_address.local is nil
  for non-blank addresses
• Added ArgumentError rescue in cast methods to convert these to ExceptionalValue
• Added test coverage for the period+space edge case and quoted spaces (which are valid
  per RFC 5322)

This ensures the edge case is caught early rather than silently passing through with
incomplete parsing.

Devin session: https://app.devin.ai/sessions/7c98f21a4e8a404c9febed036f9b9820
Requested by: Grant

[devin-ai-integration]

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[Copilot]

Pull request overview

This PR fixes handling of email addresses containing spaces in the local part by adding validation to detect when the Mail gem fails to parse the local portion. When an email like g. speel@example.com is provided, the Mail gem silently sets local to nil without raising an error, which this change now catches and converts to an ExceptionalValue.

Changes:

• Added validation in EmailAddress#initialize to raise ArgumentError when local part is nil for non-blank addresses
• Updated cast methods in both EmailAddress and DisplayNameEmailAddress to rescue ArgumentError and convert to ExceptionalValue
• Added comprehensive test coverage for unquoted spaces, period+space combinations, and valid quoted spaces

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
lib/rails_values/email_address.rb	Added nil local part validation and ArgumentError rescue in cast method
lib/rails_values/display_name_email_address.rb	Added ArgumentError rescue in cast method for consistency
spec/rails_values/email_address_spec.rb	Added test cases for space handling edge cases
rails_values.gemspec	Bumped version to 2.0.6
CHANGELOG.md	Documented the email address space handling fix

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