[codemirror6] Fix color picker to work in Javascript

[khanniie]

Issue:

Fixes #3814

Demo:

Screen.Recording.2026-03-17.at.2.41.19.PM.mov

Changes:

Instead of using the uiwjs colorpicker extension, use a version that I've modified to:

• Support Javascript
• have a persistent colorpicker dialog that doesn't dismiss every time you select a color
• have the text/widget color dynamically change as the user moves the colorpicker around
• work for rgba(_, _, , 0) and rgba(, _, _, 1)

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• has no typecheck errors (npm run typecheck)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123
• meets the standards outlined in the accessibility guidelines

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