Update backend models, controllers, and session

src/models/profile.py

@@ -4,13 +4,18 @@ class Profile(Model):
     def __init__(self):
         super().__init__()
 
-    def create(self, name=""):
+    def create(self, name="", profile_type="tabs"):
+        """
+        Create a new profile.
+        profile_type: "tabs" or "scenes" (ignoring scenes for now)
+        """
         next_id = self.get_next_id()
         self[next_id] = {
             "name": name,
-            "tabs": {},
-            "palette": [],
-            "tab_order": []
+            "type": profile_type,  # "tabs" or "scenes"
+            "tabs": [],  # Array of tab IDs
+            "scenes": [],  # Array of scene IDs (for future use)
+            "palette": []
         }
         self.save()
         return next_id