feat(Email Trigger (IMAP) Node): IMAP trigger node returns message UIDs

[umanamente]

Summary

This PR adds returning the UID for each email message in the IMAP Trigger node. This allows subsequent nodes to use the UID for email manipulation. For example, the community IMAP node n8n-nodes-imap supports moving and copying emails between mailboxes, which requires the UID. Previously, this information was missing in the IMAP Trigger node output.

Steps to test:

1. Configure the IMAP Trigger node.
2. Wait for it to return a new email message.
3. Check the output data — the attributes field should contain the UID field.

Related Linear tickets, Github issues, and Community forum posts

• Forum feature request IMAP Trigger Node - Provide email UIDs
• GitHub issue: Use With N8N native trigger node umanamente/n8n-nodes-imap#42

Review / Merge checklist

• PR title and summary are descriptive.
• Docs updated or follow-up ticket created. NO DOCS AVAILABLE IN BASELINE
• Tests included. - NO TESTS AVAILABLE IN BASELINE
• PR labeled with release/backport (if necessary). - NO NEED

[Joffcom]

Hey @umanamente,

Thanks for the PR, We have created "GHC-783" as the internal reference to get this reviewed.

One of us will be in touch if there are any changes needed, in most cases this is normally within a couple of weeks but it depends on the current workload of the team.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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