feat: Simplify Cube Manager UI by conditionally displaying pack generation mode options and automatically configuring the mode based on the selected card source.

docs/development/CENTRAL.md

@@ -8,6 +8,7 @@ The project has successfully migrated from a .NET backend to a Node.js Modular M
 -   **[2025-12-14] Parser Robustness**: Improving `CardParserService` to handle formats without Scryfall IDs (e.g., Arena exports). [Link](./devlog/2025-12-14-210000_fix_parser_robustness.md)
 -   **[2025-12-14] Set Generation**: Implemented full set fetching and booster box generation (Completed). [Link](./devlog/2025-12-14-211000_set_based_generation.md)
 -   **[2025-12-14] Cleanup**: Removed Tournament Mode and simplified pack display as requested. [Link](./devlog/2025-12-14-211500_remove_tournament_mode.md)
+-   **[2025-12-14] UI Tweak**: Auto-configured generation mode based on source selection. [Link](./devlog/2025-12-14-212000_ui_simplification.md)
 
 ## Active Modules
 1.  **Cube Manager**: Fully functional (Parsing, Fetching, Pack Generation).

docs/development/devlog/2025-12-14-212000_ui_simplification.md

@@ -0,0 +1,18 @@
+# Enhancement: UI Simplification for Set Generation
+
+## Status: Completed
+
+## Summary
+Refined the Cube Manager UI to hide redundant options when generating packs from an entire expansion set.
+
+## Changes
+1.  **CubeManager.tsx**:
+    *   **Conditional Rendering**: The "Card Source" options (Chaos Draft vs Split by Expansion) are now **hidden** when "From Expansion" mode is selected.
+    *   **Automatic State Handling**:
+        *   Selecting "From Expansion" automatically sets generation mode to `by_set`.
+        *   Selecting "Custom List" resets generation mode to `mixed` (user can still change it).
+    *   **Rationale**: Using an entire set implies preserving its structure (one set), whereas a custom list is often a cube (chaos) or a collection of specific sets where the user might want explicitly mixed packs.
+
+## Impact
+*   Reduces visual noise for the user when they simply want to draft a specific set.
+*   Prevents invalid configurations (e.g., selecting "Chaos Draft" for a single set, which technically works but is confusing in context of "Set Generation").