When archiving a chat, there should be a clear warning that unpinned archived chats will be hidden from Project view, even if they belong to a project.
Currently, this behavior is not obvious and can make users think their project chats were deleted or lost.
Suggestion:
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Show a confirmation message when archiving:
“Archived chats that are not pinned will be hidden from this project. Pin important chats before archiving.”
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Or provide an action option:
[Pin & Archive] | [Archive anyway]
This would greatly improve clarity and prevent confusion, especially for project-based workflows (e.g. notes, coding studies).