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").

src/client/src/modules/cube/CubeManager.tsx

@@ -184,13 +184,19 @@ export const CubeManager: React.FC = () => {
           {/* Source Toggle */}
           <div className="flex p-1 bg-slate-900 rounded-lg mb-4 border border-slate-700">
             <button
-              onClick={() => setSourceMode('upload')}
+              onClick={() => {
+                setSourceMode('upload');
+                setGenSettings(prev => ({ ...prev, mode: 'mixed' }));
+              }}
               className={`flex-1 py-1.5 text-xs font-bold rounded-md transition-all ${sourceMode === 'upload' ? 'bg-slate-700 text-white shadow' : 'text-slate-500 hover:text-slate-300'}`}
             >
               Custom List
             </button>
             <button
-              onClick={() => setSourceMode('set')}
+              onClick={() => {
+                setSourceMode('set');
+                setGenSettings(prev => ({ ...prev, mode: 'by_set' }));
+              }}
               className={`flex-1 py-1.5 text-xs font-bold rounded-md transition-all ${sourceMode === 'set' ? 'bg-slate-700 text-white shadow' : 'text-slate-500 hover:text-slate-300'}`}
             >
               From Expansion
@@ -301,7 +307,8 @@ export const CubeManager: React.FC = () => {
                 <Settings className="w-4 h-4 text-emerald-400" /> Configuration
               </h3>
 
-              {/* Mode */}
+              {/* Mode - Only show for Custom List */}
+              {sourceMode === 'upload' && (
                 <div className="mb-4">
                   <label className="text-xs font-bold text-slate-400 uppercase mb-1 block">Card Source</label>
                   <div className="flex flex-col gap-2">
@@ -315,6 +322,7 @@ export const CubeManager: React.FC = () => {
                     </label>
                   </div>
                 </div>
+              )}
 
               {/* Rarity */}
               <div className="mb-4">