refactor(cdk-experimental/radio-group): use shared example classes

[wagnermaciel]

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[Copilot]

Pull Request Overview

This PR refactors the CDK experimental radio-group examples to leverage shared example utility classes, removing duplicated CSS rules and unifying markup across all examples.

• Stripped out custom stateful and disabled selectors from radio-common.css in favor of centralized shared example classes.
• Updated each radio-group example HTML to add .example-parent on the container and .example-stateful/.example-selectable on each radio button.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/components-examples/cdk-experimental/radio-group/radio-common.css	Removed duplicated stateful/disabled CSS rules now provided by shared example classes.
src/components-examples/cdk-experimental/radio-group/cdk-radio-group-standard/.../example.html	Added .example-parent to <ul> and .example-stateful, .example-selectable to <li>.
src/components-examples/cdk-experimental/radio-group/cdk-radio-group-readonly/.../example.html	Added .example-parent to <ul> and .example-stateful, .example-selectable to <li>.
src/components-examples/cdk-experimental/radio-group/cdk-radio-group-horizontal/.../example.html	Added .example-parent to <ul> and .example-stateful, .example-selectable to <li>.
src/components-examples/cdk-experimental/radio-group/cdk-radio-group-disabled/.../example.html	Added .example-parent to <ul> and .example-stateful, .example-selectable to <li>.
src/components-examples/cdk-experimental/radio-group/cdk-radio-group-disabled-skipped/.../example.html	Added .example-parent to <ul> and .example-stateful, .example-selectable to <li>.
src/components-examples/cdk-experimental/radio-group/cdk-radio-group-disabled-focusable/.../example.html	Added .example-parent to <ul> and .example-stateful, .example-selectable to <li>.
src/components-examples/cdk-experimental/radio-group/cdk-radio-group-configurable/.../example.html	Added .example-parent to <ul> and .example-stateful, .example-selectable to <li>.
src/components-examples/cdk-experimental/radio-group/cdk-radio-group-active-descendant/.../example.html	Added .example-parent to <ul> and .example-stateful, .example-selectable to <li>.

Comments suppressed due to low confidence (2)

src/components-examples/cdk-experimental/radio-group/radio-common.css:25

• The background-color rule for disabled .example-radio-group was removed; ensure the shared utility classes include equivalent styling so disabled groups remain visually distinguishable.

.example-radio-group[aria-disabled='true'] {

src/components-examples/cdk-experimental/radio-group/radio-common.css:77

• The opacity reduction for disabled radio button text was removed; verify that the shared example classes apply a clear disabled-state visual indicator for readability.

}