playground: add Lottie sample

[tinyjin]

• renamed the existing Lottie example to Animation to align with thorvg.example
• added a lottie.ts sample

[Copilot]

Pull request overview

This PR updates the playground showcase to better align with the upstream/native example naming by renaming the existing Lottie playback example to “Animation”, and adds a new “Lottie” grid sample.

Changes:

• Renamed the existing Lottie example to Animation (new id + thumbnail + native example reference).
• Added a new lottie.ts sample that renders many Lottie animations in a grid.
• Added a new thumbnail asset for the renamed Animation example.

Reviewed changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated 2 comments.

File	Description
playground/public/assets/animation-thumbnail.png	Adds a thumbnail for the renamed Animation showcase entry.
playground/lib/examples/animation.ts	Renames the previous Lottie example to “Animation” and changes its id/thumbnail/reference.
playground/lib/examples/lottie.ts	Introduces a new Lottie grid sample that fetches many Lottie JSONs and animates them.
playground/lib/examples/index.ts	Wires the renamed Animation example and the new Lottie example into the showcase list.

Comments suppressed due to low confidence (2)

playground/lib/examples/animation.ts:6

• AnimationExample is exported in PascalCase, but the rest of the examples in this folder use lowerCamelCase (e.g., basicShapesExample, pictureJpgExample). To keep naming consistent and avoid special-casing imports/exports, rename this export to match the established *Example naming pattern and update its import/usage in examples/index.ts.
  playground/lib/examples/animation.ts:5
• Changing the example id from lottie-animation to animation will break existing deep links/bookmarks to /showcase/lottie-animation and any saved state keyed by the old id. Consider keeping the old id (and only updating title/thumbnail), or adding an alias/redirect path so both ids resolve to the same example.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[github-actions]

🚀 Playground preview deployment ready!

🎮 Playground: https://thorvg-playground-qv5auinjg-thorvg-web.vercel.app

[github-actions]

🚀 Playground preview deployment ready!

🎮 Playground: https://thorvg-playground-4i5yyvfew-thorvg-web.vercel.app

[hermet]

Let's consider adding this after performance stabilization