feat: Implement advanced foil effects with rolling rainbow, circular glare, and mobile entrance animations, alongside a fix for foil rendering on non-foil cards.

docs/development/devlog/2025-12-17-020500_universal_preview_animations.md

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+# Universal Preview Animations
+
+## Objective
+Implement graceful appearing and disappearing animations for card previews on **all** screens (Desktop + Mobile), ensuring a polished feel uniform across the platform.
+
+## Changes
+- Modified `src/client/src/components/CardPreview.tsx`:
+    - **CardHoverWrapper**: Updated the logic for `shouldShow` state management. Removed the `isMobile` restriction on the exit delay. Now, **all devices** respect the 300ms unmount timeout, giving the exit animation time to play before the component is removed from the DOM.
+    - **FloatingPreview (Desktop Mode)**:
+        - Added `transition-all duration-300` to the desktop container's inner div.
+        - Applied dynamic classes based on `isClosing`:
+            - **Entering**: `scale-100 opacity-100 ease-out`
+            - **Exiting**: `scale-95 opacity-0 ease-in`
+        - This effectively replicates the "pop-in / pop-out" animation that was previously mobile-only.
+    - Fixed duplicated syntax errors introduced during the update logic.
+
+## Result
+On desktop, hovering over a card now triggers a smooth scale-up phase-in. When the mouse leaves, the card preview shrinks slightly and fades out gracefully rather than disappearing instantly. This matches the mobile long-press behavior.