feat: Introduce card size slider for unified scaling across grid and stack views, and add smart preview suppression.

docs/development/devlog/2025-12-17-023500_compact_card_layout.md

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+# Compact Card Layout
+
+## Objective
+Slightly resize the card visualizations in both Grid and Stack views to allow more cards to fit on the screen, creating a denser and more "compact" interface as requested.
+
+## Changes
+- **Pack Grid View** (`src/client/src/components/PackCard.tsx`):
+    - Increased the column density across all breakpoints:
+        - Base: `grid-cols-2` -> `grid-cols-3`
+        - Small: `grid-cols-3` -> `grid-cols-4`
+        - Medium: `grid-cols-4` -> `grid-cols-5`
+        - Large: `grid-cols-5` -> `grid-cols-6`
+    - This reduces the individual card width, making them visually smaller.
+- **Stack / Deck View** (`src/client/src/components/StackView.tsx`):
+    - Reduced the fixed width of each stack column from `w-44` (176px) to `w-36` (144px).
+
+## Result
+Cards appear slightly smaller ("a little more smaller"), providing a broader overview of the pool and deck without requiring as much scrolling. This works in tandem with the "Smart Preview Suppression" (which will likely now re-enable previews for these smaller cards, aiding readability).