Fix empty type filter dropdown in raw material library

- Modified load_sub_categories() to show all subcategories when "全部类目" is selected
- Fixed category creation logic to support all major categories, not just "布料"
- Improved subcategory filtering to work properly with existing data

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

fabric_manager_pro.py

@@ -474,22 +474,30 @@ class RawMaterialLibraryDialog(QDialog):
         self.sub_combo.blockSignals(True)
         self.sub_combo.clear()
         self.sub_combo.addItem("全部类型")
-        if major in ("全部类目", ""):
-            self.sub_combo.blockSignals(False)
-            self.load_table()
-            return
         
         try:
             with self.get_conn() as conn:
-                cursor = conn.execute("SELECT category FROM fabrics WHERE category LIKE ? OR category = ?", (major + "-%", major))
+                if major in ("全部类目", ""):
-                subs = set()
+                    # 如果选择"全部类目"，显示所有子类型
-                for row in cursor.fetchall():
+                    cursor = conn.execute("SELECT DISTINCT category FROM fabrics WHERE category LIKE '%-%'")
-                    cat = row[0]
+                    subs = set()
-                    if '-' in cat:
+                    for row in cursor.fetchall():
-                        subs.add(cat.split('-', 1)[1])
+                        cat = row[0]
-                self.sub_combo.addItems(sorted(subs))
+                        if '-' in cat:
+                            subs.add(cat.split('-', 1)[1])
+                    self.sub_combo.addItems(sorted(subs))
+                else:
+                    # 显示特定主类目下的子类型
+                    cursor = conn.execute("SELECT category FROM fabrics WHERE category LIKE ? OR category = ?", (major + "-%", major))
+                    subs = set()
+                    for row in cursor.fetchall():
+                        cat = row[0]
+                        if '-' in cat:
+                            subs.add(cat.split('-', 1)[1])
+                    self.sub_combo.addItems(sorted(subs))
         except:
             pass
+        
         self.sub_combo.blockSignals(False)
         self.load_table()
 
@@ -659,7 +667,10 @@ class RawMaterialLibraryDialog(QDialog):
         if "胸杯" in sub:
             major = "辅料"
 
-        category = "布料-" + sub if major == "布料" and sub else (sub or major)
+        if major and sub:
+            category = major + "-" + sub
+        else:
+            category = sub or major
 
         supplier = self.add_supplier.currentText().strip()
         color = self.add_color.text().strip()