Fixes#6974
- Add max-height constraints to prevent modals from exceeding viewport
- Enable vertical scrolling with overflow-y-auto on content areas
- Improve mobile responsiveness with consistent padding
- Separate fixed header from scrollable content using flexbox
- Add touch scrolling support for iOS devices
This ensures buttons like "Back" and "Continue" remain accessible
on small devices by allowing users to scroll the modal content.
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Co-Authored-By: Claude <noreply@anthropic.com>
