feat(clickgui): auto-align panels on background double-click

[M4h45amu7x]

Double-click empty space in the ClickGUI to auto-arrange all panels toward that spot:

• left / right = vertical column on that side
• center = grouped near the top under the search bar

Panels glide into place and dragging still works like before.

[liquidbounce-support-bot]

Thanks for the PR, @M4h45amu7x — nice quality-of-life idea, and the drag-to-still-work handling looks thought through.

A couple of things for the reviewers to weigh in on (not blockers, just flags):

• Coordinate space / scaling: arrangePanels mixes catcherElement.offsetWidth/offsetHeight and each panel's getSize() (real layout px) with setPosition, which writes into panelConfig.left/top — a space the drag code scales by 2 / $scaleFactor. If the ClickGUI is rendered at a non-default scaleFactor, the measured area size and the stored positions may not be in the same units, so panels could land off-screen or overlap. Worth testing at a couple of GUI scales.
• Full-screen catcher: .align-catcher is position: fixed; inset: 0. Please double-check it doesn't swallow double-clicks intended for anything sitting at the base z-index, and that it behaves under the ClickGUI's own transform.
• Discoverability: a double-click gesture with no visible hint is easy to miss — might be worth a mention in the ClickGUI docs page if this lands.

I couldn't find an existing issue tracking this, so it looks new rather than a duplicate. Leaving the actual review to the maintainers.

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🤖 Automated support reply — a human maintainer will review if this doesn't help.