Use manifest defaults when adding components and refresh properties from device

- Populate prop elements with manifest default values when adding
  components in both offline and live mode
- Send config values from manifest in SOX add command for live devices
- Refresh button in properties panel now fetches fresh values from
  the connected device before re-reading the DOM
- Properties panel fetches device values on open in live mode

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

device_session.py

@@ -53,9 +53,10 @@ class DeviceSession:
         self._load_slot_registry(parts)
 
         root_comp = self.sox_client.load(0)
-        # Pre-load immediate children so the tree shows the first level
         if root_comp and root_comp.children:
-            self.load_children(root_comp.id)
+            children = self.load_children(root_comp.id)
+            if children:
+                self.sox_client.update(children, CONFIG | RUNTIME)
         return root_comp
 
     def disconnect(self):
@@ -283,8 +284,7 @@ class DeviceSession:
 
         app_elem = ET.SubElement(sax_root, "app")
         if root_comp is not None:
-            # Build children of root directly under <app>, matching .sax format
-            # where <app> IS the root container (not a <comp>)
+            app_elem.set("id", str(root_comp.id))
             for child_id in root_comp.children:
                 child_comp = self.sox_client.cache_get(child_id)
                 if child_comp is not None: