Collapse all button for projects sidebar

[kyziq]

What Changed

• Added "Collapse all" button (ChevronsDownUpIcon) to the Projects section header, alongside the existing sort and add-project buttons
• Button hidden when no projects exist
• Button disabled (dimmed) when all projects are already collapsed — visual feedback that the action is a no-op
• New pure function collapseAllProjects(state, projectIds[]) in uiStateStore — only targets currently visible projects, not stale state entries
• No-op guard returns same state reference when nothing changes, preventing unnecessary re-renders
• Three unit tests covering collapse behavior and no-op case

Why

With multiple projects open in the sidebar, collapsing each one individually is tedious. This adds a single-click way to reset the sidebar to a clean state.

UI Changes

Screenshots

Before	After

No project

Will not show the button

Video

Zen.mp4

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

Closes #2306

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Note

Low Risk
Low risk UI/state change limited to sidebar expand/collapse behavior; main risk is unintended collapsed state if the wrong project keys are passed to the new bulk action.

Overview
Adds a new bulk collapse menu to the sidebar Projects header (hidden when there are no projects) with actions to Collapse all projects and Minimize all thread lists, and disables the trigger when both are already fully collapsed/minimized.

Introduces a uiStateStore action/pure function collapseAllProjects(state, projectIds) (with no-op state preservation) and wires it into Sidebar to collapse only the currently visible/ordered project groups; adds unit tests covering the bulk-collapse behavior and no-op case.

^{Reviewed by Cursor Bugbot for commit 9151a02. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add collapse all button to projects sidebar

• Adds a bulk actions menu to the projects sidebar header with two options: 'Collapse all projects' and 'Minimize all thread lists'.
• Introduces collapseAllProjects in uiStateStore.ts as a pure reducer that sets all provided project IDs to collapsed.
• The menu trigger is disabled when both all projects are already collapsed and all thread lists are minimized; individual menu items disable independently based on current state.

^{Macroscope summarized 9151a02.}

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[macroscopeapp]

Approvability

Verdict: Approved

This PR adds a simple UI convenience feature (collapse all projects button) with proper unit tests. The implementation follows existing patterns in the codebase and is fully additive without modifying existing behavior.

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[juliusmarminge]

what do you tihnk of making this 3 states:

• minimize all - collapses every project down to the "show less" state
• collapse all - collapses every project completely
• disabled - when everything's collapsed

[kyziq]

thanks for your reply julius!

looked at vscode, jetbrains, github. all have collapse-all only, no minimize. so my first thought was to keep it simple. but you have a point, minimize-all is actually useful here since projects can hold many threads with overflow, lets you reset it without losing your place

If we want both, I think a dropdown trigger (single header slot) feels cleaner than two adjacent buttons or one single button that does all. what do you think?

[kyziq]

prototyped the dropdown:

t3code-05052026.mp4

• collapse-all enabled when any project is expanded
• minimize-all enabled when any thread list is expanded
• trigger enabled when either applies

happy either way. can revert to collapse-all only if you prefer minimal.

Dismissing prior approval to re-evaluate 9151a02