Add middle-click close for right panel tabs

[huxcrux]

What Changed

Adds support for closing right panel tabs with a middle mouse click.

This applies to the tab strip in the expandable right panel, including browser preview tabs and singleton surfaces like Diff. Middle-click uses the same close path as the existing tab close button, so existing cleanup behavior is preserved.

Why

Right panel tabs behave like browser/editor tabs, where middle-click is a common shortcut for closing a tab. The previous implementation only allowed closing via the visible close button or context menu, which makes repeated tab cleanup slower.

UI Changes

No static visual changes.

Interaction change: middle-clicking a right panel tab now closes that tab.

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

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Note

Low Risk
Small UI-only interaction change that routes through the existing tab close callback; no auth, data, or backend impact.

Overview
Right panel tab strips now support middle-click to close, matching common browser/editor tab behavior.

Each tab gets onMouseDown and onAuxClick handlers that call the existing onCloseSurface path (same as the close button and context menu). A small shouldCloseRightPanelTabOnAuxClick helper limits the action to the middle button (button === 1); left and right clicks are unchanged. preventDefault on middle mousedown avoids default browser behavior such as autoscroll.

^{Reviewed by Cursor Bugbot for commit a56c2e1. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add middle-click close for right panel tabs

Adds onMouseDown and onAuxClick handlers to each tab in RightPanelTabs. Middle-clicking a tab calls onCloseSurface for that tab and suppresses default browser behavior (e.g. autoscroll); left and right clicks are unaffected.

^{Macroscope summarized a56c2e1.}

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Approvability

Verdict: Approved

Simple, self-contained UI enhancement adding middle-click to close tabs. The logic is trivial (checking mouse button === 1), includes a unit test, and uses existing close functionality with no side effects.

No code changes detected at a56c2e1. Prior analysis still applies.

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