- Add required prop to FormInput with red asterisk indicator
- Make all form fields required (name, company, email, message)
- Add aria-label and aria-required attributes to inputs
- Add aria-label to all buttons (Back, Submit, Learn More)
- Add role='group' to button container
- Fix logo size inconsistency (55px → 56px)
Co-authored-by: openhands <openhands@all-hands.dev>