Blurring the To/Cc/Bcc field (or Enter, or a comma) committed whatever was
typed — a name like "John" became a recipient that could never be
delivered. Only valid addresses ("a@x.com" or "Name <a@x.com>") now become
chips; anything else stays in the input, marked red, to fix or complete
from the suggestions. A pasted list keeps just its invalid parts.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
