Fix variable indicators showing all vars as undefined when opening saved request in new tab

src/window.py

@@ -372,6 +372,10 @@ class RosterWindow(Adw.ApplicationWindow):
         # Populate environment dropdown if project_id is set
         if project_id and hasattr(widget, '_populate_environment_dropdown'):
             widget._populate_environment_dropdown()
+            # Re-run indicator update now that project_manager is injected;
+            # the earlier call in __init__ ran with project_manager=None and
+            # incorrectly marked all variables as undefined.
+            widget._update_variable_indicators()
 
         # Connect to send button
         widget.send_button.connect("clicked", lambda btn: self._on_send_clicked(widget))