feat: Unify card fetching/parsing and pack generation into a single handleGenerate function and button.

docs/development/devlog/2025-12-17-142500_responsive_pack_grid.md

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+# Responsive Pack Grid Layout
+
+## Objective
+Update the generated packs UI to maximize pack density on screen when the user reduces the card size.
+
+## Requirements
+- When the card size slider is under 25% (value <= 150), switch the pack container layout from a vertical stack (`grid-cols-1`) to a responsive multi-column grid (`grid-cols-1 md:grid-cols-2 xl:grid-cols-3` etc.).
+- Ensure this applies to all view modes (List, Grid, Stack).
+- Maintain consistency in UI.
+
+## Implementation
+- Modified `src/client/src/modules/cube/CubeManager.tsx`.
+- Added conditional logic to the main packs container `div`.
+- Condition: `cardWidth <= 150`.
+- Classes: `grid-cols-1 md:grid-cols-2 xl:grid-cols-3 2xl:grid-cols-4` for compact mode.
+
+## Verification
+- Verified using browser simulation.
+- Verified that setting slider to 100 triggers the grid layout.
+- Verified that setting slider to 300 reverts to vertical stack.