Add a video element to hs.ui. Closes #149

[cmsj]

Closes #149

[greptile-apps]

Greptile Summary

Adds JavaScript-accessible video playback and SwiftUI video elements, with queue-loop cleanup and integration coverage.

• Introduces HSVideo for playlist creation, playback control, seeking, looping, and volume.
• Adds video elements to the hs.ui.window builder.
• Extends color arguments to accept either hexadecimal strings or HSColor objects.
• Adds regression tests for color coercion and video queue management.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
Hammerspoon 2/Engine/Types/HSVideo.swift	Implements the video bridge and now removes looper-generated queue entries before restoring the single original item when looping is disabled.
Hammerspoon 2/Modules/hs.ui/Core/HSUIWindow.swift	Adds video construction to the UI builder and supports JavaScript color coercion across relevant styling methods.
Hammerspoon 2/Modules/hs.ui/Elements/UIVideo.swift	Adds a SwiftUI-backed video element with frame, opacity, and interaction modifiers.
Hammerspoon 2Tests/IntegrationTests/HSUIIntegrationTests.swift	Adds regression coverage for color argument coercion and the previously reported loop queue cleanup behavior.

_{Reviews (2): Last reviewed commit: "Fix an issue found in code review" | Re-trigger Greptile}

[cmsj]

@greptile