🤖 refactor: add data-chromatic ignore to Shimmer component

The Shimmer component uses infinite animations which cause visual regression
issues in Chromatic. Adding data-chromatic="ignore" to the component itself
tells Chromatic to ignore this element in all stories.

This approach:
- Keeps all stories enabled for visual testing
- Only ignores the animated Shimmer element pixels
- Works automatically in any story that uses Shimmer

Author: kylecarbs

src/components/ai-elements/shimmer.tsx

@@ -33,6 +33,7 @@ const ShimmerComponent = ({
         "[--bg:linear-gradient(90deg,#0000_calc(50%-var(--spread)),var(--color-background),#0000_calc(50%+var(--spread)))] [background-repeat:no-repeat,padding-box]",
         className
       )}
+      data-chromatic="ignore"
       initial={{ backgroundPosition: "100% center" }}
       style={
         {