fix: add generateUUID fallback for crypto.randomUUID in PackGeneratorService and document the solution.

docs/development/CENTRAL.md

@@ -10,6 +10,7 @@ The project has successfully migrated from a .NET backend to a Node.js Modular M
 -   **[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)
 -   **[2025-12-14] Multiplayer Game Plan**: Plan for Real Game & Online Multiplayer. [Link](./devlog/2025-12-14-212500_multiplayer_game_plan.md)
+-   **[2025-12-14] Bug Fix**: Fixed `crypto.randomUUID` error for non-secure contexts. [Link](./devlog/2025-12-14-214400_fix_uuid_error.md)
 
 ## Active Modules
 1.  **Cube Manager**: Fully functional (Parsing, Fetching, Pack Generation).

docs/development/devlog/2025-12-14-214400_fix_uuid_error.md

@@ -0,0 +1,15 @@
+# Fix UUID Error in Insecure Contexts
+
+## Problem
+The user reported a `TypeError: crypto.randomUUID is not a function` when accessing the application from a public IP. This is because `crypto.randomUUID()` is part of the Web Crypto API, which is often restricted to secure contexts (HTTPS) or localhost. When accessing via `http://PUBLIC_IP:PORT`, the browser disables this API.
+
+## Solution
+We need to implement a fallback UUID generation method that works in non-secure contexts.
+
+## Plan
+1.  Modify `src/client/src/services/PackGeneratorService.ts`.
+2.  Add a private method `generateUUID()` to the `PackGeneratorService` class (or a standalone helper function in the module) that:
+    *   Checks if `crypto.randomUUID` is available.
+    *   If yes, uses it.
+    *   If no, uses a fallback algorithm (e.g., `Math.random()` based v4 UUID generation).
+3.  Replace the call `crypto.randomUUID()` with this new method.

src/client/src/services/PackGeneratorService.ts

@@ -63,7 +63,7 @@ export class PackGeneratorService {
       }
 
       const cardObj: DraftCard = {
-        id: crypto.randomUUID(),
+        id: this.generateUUID(),
         scryfallId: cardData.id,
         name: cardData.name,
         rarity: rarity,
@@ -298,4 +298,15 @@ export class PackGeneratorService {
     }
     return newArray;
   }
+
+  private generateUUID(): string {
+    if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
+      return crypto.randomUUID();
+    }
+    // Fallback for insecure contexts or older browsers
+    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
+      var r = Math.random() * 16 | 0, v = c === 'x' ? r : (r & 0x3 | 0x8);
+      return v.toString(16);
+    });
+  }
 }