fix(actionbutton): reduce mod interception

[castastrophe]

Description

This update aims to simplify --mod- access by ensuring local variants and states aren't hooking into those custom properties for overrides. This updates all local variants and states to override the --spectrum-actionbutton- properties instead and adjusts the specificity to ensure no regressions in rendered results.

Other changes of note:

• Removes the .spectrum-ActionButton--sizeM as unnecessary and duplicate as these styles are applied in the base class.
• Reduces the use of the :not() pseudo-class in theme overrides as these selectors are more complex to remap for web component projects.

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

• Expect no visual changes to the component.
• Expect to be able to overwrite the following modifiers:

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

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. ✨

[changeset-bot]

🦋 Changeset detected

Latest commit: 5ca3f4d

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/actionbutton	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

File metrics

Summary

Total size: 2.25 MB^*

Package	Size	Minified	Gzipped
actionbutton	26.04 KB	24.95 KB	3.00 KB

actionbutton

Filename	Head	Minified	Gzipped	Compared to base
index-base.css	20.12 KB	19.27 KB	2.70 KB	🔴 ⬆ 0.01 KB
index-theme.css	8.66 KB	8.42 KB	0.94 KB	🔴 ⬆ 0.96 KB
index.css	26.04 KB	24.95 KB	3.00 KB	🔴 ⬆ 0.72 KB
metadata.json	15.75 KB	-	-	🔴 ⬆ 1.44 KB
themes/express.css	6.59 KB	6.39 KB	0.93 KB	🔴 ⬆ 0.85 KB
themes/spectrum-two.css	6.53 KB	6.33 KB	0.93 KB	🔴 ⬆ 0.85 KB
themes/spectrum.css	6.76 KB	6.56 KB	0.95 KB	🔴 ⬆ 0.85 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.

[github-actions]

🚀 Deployed on https://pr-3664--spectrum-css.netlify.app

[github-actions]

⚠️ [stylelint] <spectrum-tools/no-unused-custom-properties> _{reported by reviewdog 🐶}
Unused custom property --spectrum-actionbutton-border-color defined