Implement sync_from_state methods for Area, Brand, Item, RoomFunction, and Room models; enhance entity management and foreign key resolution in settings

static/js/widget.js

@@ -1,10 +1,14 @@
 const ComboBoxWidget = (() => {
-    let tempIdCounter = -1;
+    let tempIdCounter = 1;
+
+    function createTempId(prefix = "temp") {
+        return `${prefix}-${tempIdCounter++}`;
+    }
 
     function createOption(text, value = null) {
         const option = document.createElement('option');
         option.textContent = text;
-        option.value = value ?? (tempIdCounter--);
+        option.value = value ?? createTempId();
         return option;
     }
 
@@ -144,6 +148,7 @@ const ComboBoxWidget = (() => {
         initComboBox,
         createOption,
         sortOptions,
-        handleComboAdd
+        handleComboAdd,
+        createTempId
     };
 })();