Add React 19 to peer dependencies (#59)

Update for Material UI v6.

Fixes #58

Fix importing icons when using Next.js SSG/SSR, for real this time.

Generate esm files for all icons.

Update to mdi 7.4.47.

Update to mdi 7.4.47.

Update to mdi 7.4.47.

Update to mdi 7.2.96.

Update to mdi 7.2.96.

Update to mdi 7.2.96.