refactor(launchpad): add open and close animation

[dauriamarco]

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

---

• I confirm that this MR follows the contribution guidelines.

[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.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for Github and other Google products, sign up here.

You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[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

[spliffone]

Could we rename the class to something like launchpad-leave the expand +. leave confuses me while reading it?

[dauriamarco]

done 👍

[spike-rabbit]

Seesm like you have some redundant transition definition. Otherwise 👍

[github-actions]