Update React, React-Dom to 19 (#303)

This pull request finalizes the production build setup and resolves
related frontend issues. Key updates include:

- Removed unused preload reference for `cyber-bg.webp` to suppress
browser warnings.
- Corrected image paths and visibility logic in the `HeroImage`
component.
- Updated the `FooterForm` component to include proper `autocomplete`
attributes for improved autofill support.
- Ensured all public assets are correctly referenced for deployment
compatibility.

## Related Issues

- Resolves image preload warning
- Improves form accessibility and browser autofill behavior

Author: milliorn