Upgrade to modern Angular v21: Zoneless, Application Builder, CSS animation

[kyesil]

Description

I wanted to update this project so I could use it in one of my own applications. My goal was to contribute improvements without breaking the existing behavior, applying modern technology updates while keeping everything stable.

Type of change

1. Updated Angular to v21
2. Migrated to the new Angular application builder
3. Updated animations to match Angular v21 requirements
4. Switched the project to zoneless Angular
5. Converted theming to use light-dark() CSS functions.
6. Removed unused and outdated packages

• Previously: 985 packages installed (bun install)
• Now: 552 packages installed (bun install)

Notes

These changes were made with extra care to ensure the existing functionality and behavior remain intact.
I hope the updates are useful.

[siarheihuzarevich]

Thank you, I'll check during the week

[siarheihuzarevich]

Hi!
Thanks for updating the example, but after the changes several critical issues appeared that break the interface:
• the ImagePicker no longer opens;
• the padding and border-radius panels stopped working;
• all panels lost their shadows;
• some components no longer render correctly.

It looks like the refactoring changed some key parts of the structure and styling. Please review the changes and try to restore both functionality and the visual consistency of the original example.