fix(stepper): border focus hover color

[marissahuysentruyt]

Description

During #3536, we found that the stepper had more bugs particularly in dark mode, and particularly when you hovered over other states, like focus or keyboard-focus. This PR should revamp the CSS so that the stepper states are triggered in the expected way, where hovering over any of the nested subcomponents triggers the correct border color changes to all subcomponents. As an example, hovering over the stepper buttons should trigger a border color change in the stepper buttons, AS WELL AS trigger the border color on the stepper textfield.

Jira/Specs

CSS-1127
Also related to CSS-1112

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

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

Before 🚫

After ✅

To-do list

• I have read the contribution guidelines.
• I have updated relevant storybook stories and templates.
• 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. ✨

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[marissahuysentruyt]

TODO: remove these commented properties.

[github-actions]

File metrics

Summary

Total size: 2.25 MB^*
✅ No change in file sizes

Package	Size	Minified	Gzipped
infieldbutton	15.55 KB	14.97 KB	1.87 KB
picker	28.12 KB	26.85 KB	3.38 KB
stepper	18.87 KB	17.99 KB	2.33 KB

File change details

infieldbutton

Filename	Head	Minified	Gzipped	Compared to base
index-base.css	14.77 KB	14.22 KB	1.78 KB	-
index-theme.css	1.65 KB	1.61 KB	0.57 KB	-
index.css	15.55 KB	14.97 KB	1.87 KB	🔴 ⬆ < 0.01 KB
metadata.json	7.74 KB	-	-	🟢 ⬇ 0.03 KB
themes/express.css	1.37 KB	1.33 KB	0.57 KB	-
themes/spectrum-two.css	1.38 KB	1.35 KB	0.57 KB	🔴 ⬆ < 0.01 KB
themes/spectrum.css	1.39 KB	1.36 KB	0.58 KB	-

picker

Filename	Head	Minified	Gzipped	Compared to base
index-base.css	27.17 KB	25.94 KB	3.30 KB	🔴 ⬆ < 0.01 KB
index-theme.css	1.84 KB	1.80 KB	0.57 KB	-
index.css	28.12 KB	26.85 KB	3.38 KB	🔴 ⬆ < 0.01 KB
metadata.json	14.89 KB	-	-	🟢 ⬇ 0.03 KB
themes/express.css	1.45 KB	1.41 KB	0.55 KB	-
themes/spectrum-two.css	1.55 KB	1.51 KB	0.56 KB	-
themes/spectrum.css	1.56 KB	1.51 KB	0.57 KB	-

stepper

Filename	Head	Minified	Gzipped	Compared to base
index-base.css	17.58 KB	16.75 KB	2.22 KB	🔴 ⬆ 0.94 KB
index-theme.css	2.86 KB	2.79 KB	0.66 KB	🔴 ⬆ 0.10 KB
index.css	18.87 KB	17.99 KB	2.33 KB	🔴 ⬆ 0.55 KB
metadata.json	9.21 KB	-	-	🔴 ⬆ 0.28 KB
themes/express.css	2.15 KB	2.07 KB	0.66 KB	🔴 ⬆ 0.09 KB
themes/spectrum-two.css	1.86 KB	1.81 KB	0.61 KB	🟢 ⬇ 0.37 KB
themes/spectrum.css	1.94 KB	1.88 KB	0.62 KB	🟢 ⬇ 0.30 KB

* Size is the sum of all main files for packages in the library.
* An ASCII character in UTF-8 is 8 bits or 1 byte.