Sidebar: make pinned threads easier to spot (separator and collapsible Pinned section)

[lamat1111]

Problem

In the sidebar, pinned threads are hard to tell apart from the normal open threads right below them. The only difference is a small pin icon, which is easy to miss. They sit in the same column with the same row style, so the "pinned" group does not read as a group.

Proposal

Make pinned threads easier to spot at the top of the list. Two options, which can be combined:

1. Separator. A visible divider between the last pinned thread and the first normal open thread.
2. Collapsible "Pinned" section. Put pinned threads in their own section with a header, like the settled threads section: it can be expanded or collapsed, so it can be compacted when not needed.

Related

• Option to keep pinned threads inside their project folder in the boring sidebar #31803 asks where pinned threads should live (inside their project folder). This idea is about making them more visible, and is independent of that.
• [Bug]: Threads in the Working section cannot be dragged into Pinned #28117 and Pinning a subagent thread succeeds but the thread never appears in the sidebar #31787 are bugs in the same area (dragging into Pinned, pinning subagent threads).
• I also proposed highlighting the "Working" header and a max height for the thread list in Sidebar: highlight the "Working" section header #33357 and Sidebar: cap the thread list above "Working" with scroll, keep "Working" pinned #33358, which touch the same sidebar.