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 Projects header

• Adds a FoldVerticalIcon button in the sidebar Projects header that collapses all expanded projects with no active threads, non-null thread status, or running terminals.
• Introduces collectSidebarNonIdleProjectIds in Sidebar.logic.ts to compute the set of projects to keep expanded, based on active project, thread status map, and running terminal thread ids.
• Refactors Sidebar.tsx to memoize threadStatusById and runningTerminalThreadIds at the component level, replacing per-item recomputation and removing the now-unused terminalStatusFromRunningIds helper.

^{Macroscope summarized 217dc7e.}

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Note

Low Risk
Low risk UI/state update confined to the sidebar; primary risk is misclassifying “idle” projects and collapsing something the user expected to stay open.

Overview
Adds a “Collapse idle projects” control to the sidebar Projects header that collapses all currently expanded projects deemed idle, while keeping the active project and any projects with visible thread activity (non-null thread status) or running terminals expanded.

To support this, introduces collectSidebarNonIdleProjectIds (with tests) and refactors Sidebar.tsx to memoize threadStatusById and runningTerminalThreadIds once per render instead of recomputing per thread row, removing the old terminal-status helper.

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[fire17]

nice touch , hope they merge

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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