fix(web-components): #4657 show select icon when disabled

[lKolabrodl]

Summary of the changes

Keeps the ic-select icon visible when the component is disabled.

The icon slot is now rendered for disabled selects and uses the existing --ic-atoms-input-select-content-icon-disabled token, so the icon is greyed out as expected.

No public API changes.

Related issue

Fixes #4657

Testing

• Added a unit regression test that verifies the icon slot is rendered when ic-select is disabled.
• Verified the fix in the Web Components Storybook playground with showIcon and disabled enabled.
• Jest summary: 67 test suites, 1,162 tests, and 656 snapshots passed.
• Prettier and Stylelint passed.
• ESLint completed with 0 errors (existing warnings only).

Checklist

General

• Changes to the docs package checked; no documentation update is required.
• All acceptance criteria reviewed and met.

Testing

• Relevant unit test added; no visual regression baseline was required.
• Playground story checked; no story or prop changes are required.
• The disabled appearance was checked against the expected behaviour in the issue.

Accessibility and additional checks

The change restores an existing decorative icon and uses the existing disabled colour token. It does not change interaction, layout, motion, content, public API, roles, or ARIA attributes.

Manual assistive technology, zoom, high contrast, cross-browser, performance, and SSR/SSG checks were not run locally.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

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