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coder/site
Ethan 348a3bd693 fix(site): show archived filter on agents page when chat list is empty (#23793)
While running scaletests I noticed the archived filter button on the
agents sidebar would disappear when the current filter had zero results.
This made it impossible to switch between active and archived views once
one side was empty.

The filter dropdown was only rendered inside the Pinned or first
time-group section header. When `visibleRootIDs` was empty, neither
header existed, so the filter had nowhere to attach.

This keeps the original dropdown placement on section headers when chats
exist. When the list is empty, the empty-state box itself now provides a
"View archived →" or "← Back to active" link so users can always switch
filters without needing the dropdown.

<img width="322" height="191" alt="image"
src="https://github.com/user-attachments/assets/7fd9ca09-5f72-4796-a925-7fab570fdff5"
/>

<img width="320" height="184" alt="image"
src="https://github.com/user-attachments/assets/2f856088-c2dc-4e34-9ece-84144a1adf79"
/>

Both archived & unarchived look the same when there's at least one
agent:

<img width="322" height="194" alt="image"
src="https://github.com/user-attachments/assets/42c4d54b-e500-45b1-b045-c126144c35bd"
/>
2026-03-31 12:57:46 +11:00
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