fix(slider): use high contrast properties and fix ramp handle circle

[jawinn]

Description

Updates the Slider high contrast styles to use all --highcontrast prefixed custom properties. It was noticed that some were being set with --spectrum prefixed custom properties. Some were duplicative, as they already had --highcontrast prefixed custom properties being set (which take precendence in the var() fallback chains). A few needed a rename.

In the process, it was also found that the ramp variant was missing the handle outer circle (gap between the ramp background and handle), that created contrast between the handle in the background. This was particularly noticeable on hover/active, as the handle was blending into the same ramp highlight color. The fix was already present but the nested .spectrum-Slider--ramp selector was missing an & to make it the same element as the .spectrum-Slider

CSS-760

How and where has this been tested?

Please tag yourself on the tests you've marked complete to confirm the tests have been run by someone other than the author.

Validation steps

• Take a look at the Ramp story in forced-colors mode. The gap around the handle should be visible.
• There are no other changes in forced-colors mode. Make sure to check filled, filled offset, hover, active, and keyboard focus.

Review note: The only changes made here are within the @media (forced-colors: active). The rest of the files modified are automatic prettier fixes, including changes to whitespace.

Regression testing

Validate:

1. The documentation pages for at least two other components are still loading, including:

• The pages render correctly, are accessible, and are responsive.

2. If components have been modified, VRTs have been run on this branch:

• VRTs have been run and looked at.
• Any VRT changes have been accepted (by reviewer and/or PR author), or there are no changes.

Screenshots

"Ramp" variant high contrast bug before and after fix:

To-do list

• I have read the contribution guidelines.
• I have tested these changes in Windows High Contrast mode.
• If my change impacts other components, I have tested to make sure they don't break.
• If my change impacts documentation, I have updated the documentation accordingly.
• ✨ This pull request is ready to merge. ✨

[changeset-bot]

🦋 Changeset detected

Latest commit: c233023

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@spectrum-css/slider	Patch

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[github-actions]

🚀 Deployed on https://pr-2752--spectrum-css.netlify.app

[github-actions]

File metrics

Summary

Total size: 4.64 MB^*
Total change (Δ): ⬇ 1.94 KB (-0.04%)

Table reports on changes to a package's main file. Other changes can be found in the collapsed Details section below.

Package	Size	Δ
slider	32.34 KB	⬇ 0.66 KB

Details

slider

File	Head	Base	Δ
index-base.css	30.00 KB	30.64 KB	⬇ 0.66 KB (-2.11%)
index-theme.css	2.92 KB	2.92 KB	-
index-vars.css	32.34 KB	32.98 KB	⬇ 0.66 KB (-1.96%)
index.css	32.34 KB	32.98 KB	⬇ 0.66 KB (-1.96%)
metadata.json	14.17 KB	14.17 KB	⬇ < 0.01 KB (-0.01%)
themes/express.css	1.76 KB	1.76 KB	-
themes/spectrum.css	1.73 KB	1.73 KB	-

* Size determined by adding together the size of the main file for all packages in the library.
* Results are not gzipped or minified.
* An ASCII character in UTF-8 is 8 bits or 1 byte.

[mdt2]

Looks great!

[mdt2]

Took another peek after the rebase conflicts and this is still looking good! Also checked in RTL. Nice work!