Port loading animations and defer gallery sections

[tobitege]

Summary

• Adds additional DaisyLoading variants ported from Flowery.Uno: battery charging/emptying and directional traffic lights.
• Adds Avalonia templates and animations for the new loader variants.
• Updates Feedback and Layout gallery examples to demonstrate the added loaders.
• Moves the heavy Loading display into a dedicated lazy-loading example view so the initial section appears quickly and later rows are created as needed.
• Replaces the inline Progress block with an embedded ProgressSection that keeps the Feedback page continuous while deferring row construction near the viewport.
• Bumps the package version to 2.0.7 and updates the changelog and loading docs.

Notes

This keeps Feedback category navigation cohesive while avoiding large upfront construction work for animation-heavy sections. ProgressSection.cs also includes a short tutorial-style comment explaining the embedded lazy section pattern for future gallery examples.

Related to #33.

[tobitege]

Works nicely!