feat: remove JS backed API's for attributes which are solely presentational

[Chris Holt (chrisdholt)]

Description

This PR converts CSS-only presentational attributes across Web Components from JavaScript fields to HTML-only attributes.

Benefits

• Removes unnecessary JavaScript fields and attribute observation.
• Reduces the runtime API surface and property synchronization logic.
• Preserves existing CSS attribute selectors and generated API metadata.

Migration

Set presentational values using HTML attributes instead of JavaScript properties. Consumers who cannot apply attributes declaratively in HTML can still use JavaScript for attribute assignment via setAttribute(), removeAttribute(), or toggleAttribute().

// Before
element.appearance = 'primary';
element.iconOnly = true;

// After
element.setAttribute('appearance', 'primary');
element.setAttribute('icon-only', '');

[github-actions]

📊 Bundle size report

✅ No changes found

[github-actions]

Pull request demo site: URL

[github-actions]

🕵🏾‍♀️ visual changes to review in the Visual Change Report

vr-tests-web-components/Avatar 1 screenshots

Image Name	Diff(in Pixels)	Image Type
vr-tests-web-components/Avatar. - Dark Mode.normal.chromium_1.png	298	Changed

vr-tests-web-components/Badge 1 screenshots

Image Name	Diff(in Pixels)	Image Type
vr-tests-web-components/Badge. - Dark Mode.normal.chromium.png	443	Changed

vr-tests-web-components/Divider 1 screenshots

Image Name	Diff(in Pixels)	Image Type
vr-tests-web-components/Divider.Inset.normal.chromium.png	2	Changed

vr-tests-web-components/Label 2 screenshots

Image Name	Diff(in Pixels)	Image Type
vr-tests-web-components/Label. - Dark Mode.normal.chromium_1.png	171	Changed
vr-tests-web-components/Label.Disabled.normal.chromium.png	116	Changed

vr-tests-web-components/Text 9 screenshots

Image Name	Diff(in Pixels)	Image Type
vr-tests-web-components/Text.Nowrap.normal.chromium.png	6094	Changed
vr-tests-web-components/Text.Strikethrough.normal.chromium.png	209	Changed
vr-tests-web-components/Text.Block.normal.chromium.png	6296	Changed
vr-tests-web-components/Text.Underline.normal.chromium.png	265	Changed
vr-tests-web-components/Text.Truncate.normal.chromium.png	5819	Changed
vr-tests-web-components/Text.Weight.normal.chromium.png	12958	Changed
vr-tests-web-components/Text.Italic.normal.chromium.png	155	Changed
vr-tests-web-components/Text.Font.normal.chromium.png	6452	Changed
vr-tests-web-components/Text.Size.normal.chromium.png	70284	Changed

[Dave Rupert (davatron5000)]

🟥  🟥  🟥  🟥  ⬜ Love seeing all this red!

Left an optional comment on the Accordion Header changes but otherwise pretty straight forward.