Upgrade to React 19

[theangchen]

Test React 19 upgrade first

• check our date picker
• check our table component

react-uswds v10.0.0 uses React 19. Once we test React 19, the upgrade to USWDS v10 should be easy.

[theangchen]

@thgaskell Can you please take a look at this vulnerability for React 19 and see if it's an issue for us?

https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components

cc: @JCopeland-PIFSC @joshua-daniel-lee