feat(icons): use open source icons

[spike-rabbit]

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[gemini-code-assist]

Summary of Changes

Hello @spike-rabbit, 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 significantly refactors the project's icon management by integrating the new @siemens/element-icons open-source library. This change streamlines icon usage, removes a large amount of custom SVG code, and introduces a more consistent approach to icon sizing and positioning throughout the UI, ensuring better maintainability and alignment with design standards.

Highlights

• Icon Library Migration: The project has migrated from a custom icon set to the new @siemens/element-icons open-source library, replacing numerous inline SVG definitions with a more streamlined import.
• Icon Sizing and Spacing Refinement: CSS styles across various components have been updated to standardize icon sizing and spacing. This includes the introduction of a new icon-large class and adjustments to margin-block and margin-inline properties for better consistency.
• Dependency Update: The package.json file now includes the @siemens/element-icons dependency, reflecting the adoption of the new open-source icon library.

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[gemini-code-assist]

Code Review

This pull request introduces a significant improvement by migrating the icon library from an internal @simpl package to the open-source @siemens/element-icons package. This change enhances maintainability and aligns with open-source best practices. Additionally, several CSS files have been refactored to remove negative margins and simplify calc() expressions for margin properties, which improves layout predictability and code readability. The icon sizing variables have also been refined to offer better control over icon presentation. Overall, these changes contribute positively to the project's maintainability and consistency.

[github-actions]

[github-actions]

Documentation.
Examples.
Playwright report.

Coverage Reports:

• element-ng
• element-translate-ng