Fixes #5702: Keep unread status on archiving

[matthewschaney]

First time contributor checklist

• [x] I have read the README and CONTRIBUTING documents
• [x] I have signed the Contributor Licence Agreement

Contributor checklist

• [x] My commits are rebased on the latest main branch

• [x] My commits are in nice logical chunks

• [x] My contribution is fully baked and is ready to be merged as is

• [x] I have tested my contribution on these devices:

  • iDevice iPhone 15 Pro, iOS 17.1.1
  • iDevice iPhone 14 Pro, iOS 17.1.1

• ---

Description

Fixes #5702: Resolved an inconsistency and potential safety issue where archiving messages marked them as read. I tested this on different simulators within Xcode, as well as my personal iOS devices.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been closed due to inactivity.

[pawisoon]

Tactical comment to keep it open.