#19019 cmux-next sidebar: more menu on group headers and workspace rows (cx-a9h6)

Group headers and workspace rows get a more (⋯) button that opens the same menu as a right-click, ChatGPT project style (cx-a9h6).

• Workspace rows: the button shows on hover and on the selected row, left of the close button. It selects the row the way a right-click does, then opens the row's context menu under the button. That menu includes pin, rename, color and icon, Reveal in Finder, and close.
• Group headers: the ⋯ button and a right-click both open the group's full menu: New Workspace, Rename, Pin, Color and Icon, Mark read, Collapse, Move, Edit Config, Copy ID, Ungroup, Close Workspaces, and Delete. A click on the group's name or chip still opens the editor (name, color, emoji). The accessibility Edit action opens the editor too.
• Both buttons use the icon pack's action.more.

Not in this PR: the group menu has no "Reveal in Finder" and no "Section" entry (the closest is Move to Space). Adding them means new catalog actions, which wait for the action-catalog freeze and regenerated exports, so they're a follow-up.

This PR is stacked on #18997 (cx-25az) and retargets to feat-cmux-next when that lands.

Visible change (native): a ⋯ button appears on the hovered or selected workspace row and on a hovered group header; clicking it opens the right-click menu.

Testing

• No unit tests (cmux-next rule). The button runs the same contextMenuProvider menu that a right-click shows, so it adds no new menu logic. Real verification: in a tagged build, hover a workspace row and a group header, click ⋯, and compare with a right-click. Not run yet.
• Fleet run-swift-testing-suites.sh and the hosted Swift canary on the exact head.

Localization: the new key sidebar.a11y.workspaceMenu ("Workspace options") is translated in all 21 locales of the sidebar catalog.

Changelog

Added: a more (⋯) button on sidebar workspace rows and group headers that opens the same menu as a right-click

🤖 Generated with Claude Code

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Summary by cubic

Adds more (⋯) buttons to sidebar group headers and workspace rows that open the same menu as a right-click, ChatGPT project style.

• Workspace rows show the button on hover and on the selected row; clicking it selects the row first, then opens the row's context menu under the button (the button is wired to its menu).
• Group headers show the button on hover; the group's full menu opens from the button or a right-click, while clicking the chip still opens the editor (accessibility Edit opens it too).
• The group's right-click now opens the full menu instead of the editor. The group menu lacks "Reveal in Finder" and "Section" entries, which need new catalog actions and are a follow-up.

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[!NOTE]
Low Risk
UI-only sidebar interaction changes that reuse existing context menus; no new menu logic or security-sensitive paths.

Overview
Adds ChatGPT-style ⋯ controls on cmux-next sidebar workspace rows and retargets group header ⋯ / right-click to the full context menu instead of opening the group editor.

Workspace rows get a new moreButton that appears on hover and when selected (left of close/badge). Tapping it selects the row like a right-click, then pops the same contextMenuProvider menu via new SidebarRowMenu. Selection changes trigger relayout so the button stays visible on the selected row.

Group headers split actions: ⋯ and right-click call groupEditing.showMenu (full group menu); chip click and VoiceOver Edit use new onEdit → groupEditing.open. showMenu is now callable from context menu handling.

Adds localized a11y string sidebar.a11y.workspaceMenu ("Workspace options") across the sidebar catalog.

^{Reviewed by Cursor Bugbot for commit 87f68b533176cbdabd2eb0c2d8e545b5e7d326fc. Bugbot is set up for automated code reviews on this repo. Configure here.}

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