Bug: Background page remains scrollable when wallet modal is open

[Pragzh]

Description

When the wallet connection modal is opened, the background page can still be scrolled. This creates a poor modal experience, especially on mobile devices.

Steps to Reproduce

1. Open wallet connection modal
2. Try scrolling the background page
3. Observe that the main page still scrolls behind the modal

Expected Behavior

Background scrolling should be disabled while the modal is active.

Actual Behavior

The page behind the modal continues scrolling, reducing focus and affecting usability.

Possible Fix

• Disable body scroll when modal opens
• Restore scrolling when modal closes
• Add proper overflow handling

Benefits of Fix

• Better modal UX
• Improved focus on wallet selection
• More polished application behavior