Fixes #33869

The Animation page in the Component Preview had a few issues.

* The animations only ran once, so you couldn't watch animations below
the fold.
* The offset math was wrong, so some animated elements were rendered
outside of their parent container.
* The "animate in from right" elements were defined with an initial
`.left()` offset, which overrode the animation behavior.

I made fixes to address these issues. In particular, every time you
click the active list item, it renders the preview again (which causes
the animations to run again).

Before:


https://github.com/user-attachments/assets/a1fa2e3f-653c-4b83-a6ed-c55ca9c78ad4

After:


https://github.com/user-attachments/assets/3623bbbc-9047-4443-b7f3-96bd92f582bf

Release Notes:

- N/A