Family Wallet Grouping Sort Animation

When the user taps the group button in the top right, the grid of wallet cards smoothly transitions into grouped sections. The individual cards slide, scale, and reposition with a highly responsive spring physics animation. Group headers fade and slide down into place, while the button text morphs from an icon to 'Hide Groups'. The layout change feels organic and tactile, using staggered spring physics to prevent visual clutter during the reorganization.