fix(ui): show message when rings/clothing API data unavailable

The Entropia Nexus API doesn't have /rings or /clothing endpoints (404).
Added placeholder messages in the accessories selector instead of showing
empty lists. Pets endpoint works correctly (84 pets loaded).

ui/accessories_selector.py

@@ -295,6 +295,13 @@ class AccessoriesSelectorDialog(QDialog):
         tree = self.tab_rings["tree"]
         tree.clear()
 
+        if not self.all_rings:
+            item = QTreeWidgetItem()
+            item.setText(0, "No ring data available from API")
+            item.setForeground(0, QColor("#888888"))
+            tree.addTopLevelItem(item)
+            return
+
         for ring in self.all_rings:
             item = QTreeWidgetItem()
             item.setText(0, ring.name)
@@ -319,6 +326,13 @@ class AccessoriesSelectorDialog(QDialog):
         tree = self.tab_clothing["tree"]
         tree.clear()
 
+        if not self.all_clothing:
+            item = QTreeWidgetItem()
+            item.setText(0, "No clothing data available from API")
+            item.setForeground(0, QColor("#888888"))
+            tree.addTopLevelItem(item)
+            return
+
         for item_data in self.all_clothing:
             item = QTreeWidgetItem()
             item.setText(0, item_data.name)