feat: Implement database management, main window and card view GUI, and a database debug script, removing verify_fix.py.

debug_db.py

@@ -0,0 +1,42 @@
+import sqlite3
+import os
+
+def debug_db():
+    db_path = "database/umamusume.db"
+    if not os.path.exists(db_path):
+        print(f"Database not found at {db_path}")
+        return
+
+    conn = sqlite3.connect(db_path)
+    cur = conn.cursor()
+
+    print("--- Database Debug ---")
+    
+    cur.execute("SELECT COUNT(*) FROM support_cards")
+    print(f"Total support cards: {cur.fetchone()[0]}")
+
+    cur.execute("SELECT COUNT(*) FROM owned_cards")
+    owned_count = cur.fetchone()[0]
+    print(f"Owned cards count: {owned_count}")
+
+    cur.execute("""
+        SELECT oc.card_id, sc.name
+        FROM owned_cards oc
+        LEFT JOIN support_cards sc ON oc.card_id = sc.card_id
+    """)
+    rows = cur.fetchall()
+    
+    print("\nOwned cards details:")
+    for card_id, name in rows:
+        print(f"  ID: {card_id}, Name: {name}")
+
+    orphaned = [row[0] for row in rows if row[1] is None]
+    if orphaned:
+        print(f"\nFound {len(orphaned)} orphaned owned cards (Card IDs: {orphaned})")
+    else:
+        print("\nNo orphaned owned cards found.")
+
+    conn.close()
+
+if __name__ == "__main__":
+    debug_db()