docs(loading-spinner): improve si-loading-button example

[spliffone]

Closes #929

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[gemini-code-assist]

Summary of Changes

Hello @spliffone, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on improving the user experience and visual consistency of the si-loading-button example. It refactors the example's layout by adjusting padding application and introduces the si-form-item component to create a more structured and aesthetically pleasing control panel for toggling the loading state. These changes aim to make the example clearer and more aligned with best practices for component usage.

Highlights

• Example Layout Refinement: The layout of the si-loading-button example has been updated, moving the main padding from the root HTML element to the host component for better encapsulation and consistency.
• Improved Control Panel: The 'Toggle loading' checkbox has been refactored to use a si-form-item component within a card structure, enhancing its visual presentation and organization.
• New Component Import: The SiFormItemComponent from @siemens/element-ng/form is now imported and utilized in the example to support the new control panel structure.

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[gemini-code-assist]

Code Review

This pull request improves the example for si-loading-button by refactoring the padding to the host element and introducing a 'Control panel' to toggle the loading state. The new control panel uses si-form-item, which is a good example of using the library's components. My review includes one suggestion to improve accessibility by adding an id to the checkbox inside the si-form-item, ensuring the label is correctly associated with it.

[github-actions]

[github-actions]

Documentation.
Examples.
Playwright report.

Coverage Reports:

• element-ng
• element-translate-ng

[spike-rabbit]

👍