feat: Implement set-based pack generation with booster box creation, including new UI for selecting MTG sets and fetching their card pools.

docs/development/devlog/2025-12-14-211000_set_based_generation.md

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+# Enhancement: Set-Based Pack Generation
+
+## Status: Completed
+
+## Summary
+Implemented the ability to fetch entire sets from Scryfall and generate booster boxes.
+
+## Changes
+1.  **ScryfallService**:
+    *   Added `fetchSets()` to retrieve expansion sets.
+    *   Added `fetchSetCards(setCode)` to retrieve all cards from a set.
+2.  **PackGeneratorService**:
+    *   Added `generateBoosterBox()` to generate packs without depleting the pool.
+    *   Added `buildTokenizedPack()` for probabilistic generation (R/M + 3U + 10C).
+3.  **CubeManager UI**:
+    *   Added Toggle for "Custom List" vs "From Expansion".
+    *   Added Set Selection Dropdown.
+    *   Added "Number of Boxes" input.
+    *   Integrated new service methods.
+
+## Usage
+1.  Select "From Expansion" tab.
+2.  Choose a set (e.g., "Vintage Masters").
+3.  Choose number of boxes (default 3).
+4.  Click "Fetch Set".
+5.  Click "Generate Packs".