[mydoxie]

Problem 1: the fake looked only at the first letter, so UserJob gave 'an UserJob'.
Fix: a vowel gives 'an', except names that start with Eu or U + consonant + vowel (User, Uni). Those give 'a'. Tests added.

Problem 2: Queue.restore() did not put back a queue set with Mail.useQueue() before Queue.fake().
Fix: fake() saves the current mail queue and restore() puts it back. Test added. Changelog lines updated.

[mydoxie]

Bot review

I ran dart analyze --fatal-infos, dart format check and dart test test/queue_fake_test.dart in a separate worktree with sibling clones. All clean, 11 tests pass.

Blocking

• None. restore() puts back the right queue for the normal order (Mail.useQueue(x), then Queue.fake(), then restore()). A second fake() keeps the first saved queue. restore() clears the saved value, so nothing leaks to later tests. No public API change.

Non-blocking

• The _youSound rule makes a wrong "a" for names that start with Un + vowel, like UnusedJob, UnauthorizedJob, UnarchiveJob (the u sounds like "uh", so "an" was right before). Fix idea: do not match when the name starts with Un + vowel, or only match a short list (Use, User, Uni, Util, Eu).
• If Mail.fake() is on when Queue.fake() runs, _currentMailQueue() returns null (it hides the fake), so a custom Mail.useQueue() queue set before is lost on restore(). Rare. Worth one line in the doc comment.
• restore() with no fake() before still overwrites a custom queue with null or QueueMailQueue. This is old behaviour, not new.
• The doc comment of _a (a SendWelcomeEmail, ...) now sits on the _youSound field, so _a has no doc comment. Move _youSound above that comment.
• The new test does not reset Mail.useQueue(null) if an expect fails before the last line. Use addTearDown(() => Mail.useQueue(null)).
• No version: bump. Changelog lines are under Unreleased and plain.