feat: nft picker added virtuoso grid

[bhavya2611]

What does this PR do?

🤖 Generated by Copilot at 9a302dc

This pull request enhances the user interface and performance of the NFT gallery and avatar features. It applies consistent styling and padding to the modal components, uses virtualized rendering and placeholders for the NFT grid, and fixes a bug with duplicate NFTs. It also adds a prop to the Card component to force rounded corners.

Related issues

Fixes #3574
Fixes ENG-23

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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Name	Status	Preview	Updated (UTC)
prerender	✅ Ready (Inspect)	Visit Preview	Sep 14, 2023 5:49am
web	✅ Ready (Inspect)	Visit Preview	Sep 14, 2023 5:49am

[linear]

ENG-23

[bigint]

Screen.Recording.2023-09-13.at.9.16.34.PM.mov

@bhavya2611 shimmer got messed up 🙈