Add a collapse-idle action to the sidebar

[ponbac]

What Changed

• Added a Collapse idle projects action to the sidebar header.
• The action collapses expanded projects that are idle (not the active project and no thread status or running terminal) while keeping the currently active project open.

Why

The sidebar can accumulate a lot of expanded projects during normal use. This adds a one-click cleanup path without collapsing the project you are currently in or other projects that still have visible thread activity.

UI Changes

Video:

screenrecording-2026-03-19_16-33-08.mp4

Sorry that the mouse cursor is not visible in the recording.

Screenshot:

Added this tiny icon. Open for suggestions on a more fitting icon.

Checklist

• This PR is small and focused
• I explained what changed and why
• [/] I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add a 'Collapse idle projects' button to the sidebar

• Adds a FoldVerticalIcon button to the Projects header in Sidebar.tsx that collapses all expanded projects not considered "non-idle".
• A project is non-idle if it is the active project or has at least one thread with a status pill or a running terminal, computed by the new collectSidebarNonIdleProjectIds utility in Sidebar.logic.ts.
• Refactors per-row thread status resolution into memoized threadStatusById and runningTerminalThreadIds maps, removing the TerminalStatusIndicator interface and terminalStatusFromRunningIds helper.

^{Macroscope summarized 5d7f5ec.}

[chatgpt-codex-connector]

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