Responsive: Add changes to modal for mobile view

[DzmitryTrubchyk]

What to do:

• Position Modal bottom sticky in mobile view (>719)
• Add ability to fix height or fill (by project needs)
• Horizontal paddings change to 18px (if possible in easy way)
• Footer: Set buttons constrains to fill for uui examples

Open in Figma and more examples for all themes here

[DzmitryTrubchyk]

We also discussed and agreed for projects, when mobile is highly important to support, is recommended:

• Use bigger component size in desktop version (to store only one page version)
• Or, scale components in mobile version

To change component size from 36 in desktop to 4 on mobile can lead to extra effort for development (do not recommended way)