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

docs/development/devlog/2025-12-17-005500_mobile_long_press.md

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+# Mobile Long-Press Card Preview
+
+## Objective
+Enhance mobile usability by allowing users to view a magnified card preview upon long-pressing (500ms) a card, instead of hover (which is disabled on mobile).
+
+## Changes
+- Modified `src/client/src/components/CardPreview.tsx`:
+    - Updated `CardHoverWrapper` to include `touchstart`, `touchend`, and `touchmove` handlers.
+    - Implemented a 500ms timer on touch start.
+    - Added logic to cancel the long-press if the user drags/scrolls more than 10 pixels.
+    - Added `onContextMenu` handler to prevent the default browser menu when a long-press triggers the preview.
+    - Updated render condition to show preview if `isHovering` (desktop) OR `isLongPressing` (mobile).
+
+## Result
+On mobile devices, users can now press and hold on a card to see the full-size preview. Lifting the finger or scrolling hides the preview.

docs/development/devlog/2025-12-17-010000_mobile_fullscreen_preview.md

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+# Mobile Fullscreen Preview
+
+## Objective
+Update the mobile card preview mechanism to display a centered, fullscreen overlay upon long-press, rather than a floating element following the touch point. This provides a clearer view of the card on small screens.
+
+## Changes
+- Modified `src/client/src/components/CardPreview.tsx`:
+    - Updated `FloatingPreview` interface to accept `isMobile: boolean`.
+    - Added conditional rendering in `FloatingPreview`:
+        - If `isMobile` is true, it renders a `fixed inset-0` overlay with a centered image, `backdrop-blur`, and entrance animations (`zoom-in` + `fade-in`).
+        - If false (desktop), it retains the original cursor-following behavior.
+    - Updated `CardHoverWrapper` to pass the `isMobile` state down to the preview component.
+    - The preview automatically disappears (unmounts) when the long-press is released, effectively creating a "fade out/close" interaction (visually, the instant close is standard; entrance is animated).
+
+## Result
+Long-pressing a card on mobile now brings up a high-quality, centered view of the card that dims the background, improving readability and usability.

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.