WIP: fixing regressions in tests

tests/test_gui_kill_button.py

@@ -6,7 +6,8 @@ def test_gui_has_kill_button_method():
  assert hasattr(App, '_cb_kill_ticket'), "App must have _cb_kill_ticket method"
 
 def test_render_ticket_queue_table_columns():
- with patch("src.gui_2.imgui") as mock_imgui:
+ with patch("src.gui_2.imgui") as mock_imgui, \
+      patch("src.gui_2.imscope") as mock_imscope:
   mock_imgui.begin_table.return_value = True
   mock_imgui.table_setup_column = MagicMock()
   mock_imgui.table_headers_row = MagicMock()
@@ -25,6 +26,15 @@ def test_render_ticket_queue_table_columns():
   mock_imgui.pop_style_color = MagicMock()
   mock_imgui.same_line = MagicMock()
   
+  # Setup imscope mocks
+  mock_imscope.window.return_value.__enter__.return_value = (True, True)
+  mock_imscope.child.return_value.__enter__.return_value = True
+  mock_imscope.table.return_value.__enter__.return_value = True
+  mock_imscope.tree_node_ex.return_value.__enter__.return_value = True
+  mock_imscope.tab_item.return_value.__enter__.return_value = (True, True)
+  mock_imscope.style_color.return_value.__enter__.return_value = None
+  mock_imscope.style_var.return_value.__enter__.return_value = None
+  
   from src.gui_2 import App
   app = App.__new__(App)
   app.active_track = MagicMock()