feat: Implement mobile long-press card preview with fullscreen overlay and animations.

docs/development/devlog/2025-12-17-010500_mobile_preview_animations.md

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+# Mobile Preview Animations
+
+## Objective
+Implement smooth "Phase In" and "Phase Out" animations for the mobile fullscreen card preview to replace the instant appear/disappear behavior.
+
+## Changes
+- Modified `src/client/src/components/CardPreview.tsx`:
+    - Updated `CardHoverWrapper` to handle component unmounting with a delay (300ms) when the preview should be hidden on mobile.
+    - Passed a new `isClosing` prop to `FloatingPreview` during this delay period.
+    - In `FloatingPreview` (Mobile View):
+        - Added `transition-all duration-300` base classes.
+        - Used conditional classes:
+            - Entrance: `animate-in fade-in zoom-in-95`
+            - Exit: `animate-out fade-out zoom-out-95` (triggered when `isClosing` is true).
+    - Fixed syntax errors introduced in previous steps (removed spaces in class names).
+
+## Result
+On mobile, the card preview now fades and zooms in smoothly when long-pressed, and fades/zooms out smoothly when released.