refactor(launchpad): add open and close animation

[dauriamarco]

Related to #1236. Adds an open/close animation for the launchpad panel.

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[gemini-code-assist]

Summary of Changes

Hello @dauriamarco, 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 enhances the user experience of the application's launchpad by introducing elegant open and close animations. Beyond the visual flair, it includes a comprehensive refactoring of the launchpad's internal components, improving its structure, responsiveness, and accessibility. Key text labels have been updated for better user understanding, and the example component now offers more robust demonstration capabilities, making the launchpad more intuitive and versatile.

Highlights

• Launchpad Animation: Implemented smooth open and close animations for the launchpad panel using CSS transitions and @starting-style directives, enhancing the user experience.
• UI/UX Enhancements: Refined the launchpad's visual layout, including updated app item styling, an improved header structure with a repositioned close button, and responsive adjustments for mobile views.
• Text Label Updates: Standardized several launchpad text labels, changing 'Launchpad' to 'Switch applications' and 'Favorite apps' to 'Favorites' for improved clarity and consistency.
• API and Translation Key Changes: Updated the SiLaunchpadFactoryComponent API to allow an optional subtitle and introduced a new translation key (SI_LAUNCHPAD.EXTERNAL_LINK) for external link accessibility.
• Example Component & Test Improvements: Enhanced the launchpad example with interactive controls for enabling/disabling favorites and categories, and updated Playwright tests and snapshots to reflect the UI and text modifications.
• Z-index Adjustment: Modified the z-index layering for the launchpad to ensure correct visual stacking relative to the application header.

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[gemini-code-assist]

Code Review

This pull request successfully adds open and close animations to the launchpad and refactors its components for an improved design. The changes are well-implemented, especially the use of modern CSS for animations and the significant enhancements to the example page.

I have a couple of suggestions. One is a critical fix for a test in playwright/e2e/element-examples/si-launchpad.spec.ts where the test logic contradicts its purpose, and I've added a reference to a rule regarding test resilience. The other is a suggestion to improve the maintainability of the example component in src/app/examples/si-application-header/si-launchpad.ts by refactoring how app categories are determined. Overall, great work on this feature.

[github-actions]

Documentation.
Examples.
Playwright report.

Coverage Reports:

• element-ng
• element-translate-ng

[github-actions]