chore(tests): Final stabilization of test suite and full isolation of live_gui artifacts

gui_2.py

@@ -1378,8 +1378,9 @@ class App:
 
  def _test_callback_func_write_to_file(self, data: str) -> None:
   """A dummy function that a custom_callback would execute for testing."""
-  # Note: This file path is relative to where the test is run.
-  # This is for testing purposes only.
+  import os
+  # Ensure the directory exists if running from a different cwd
+  os.makedirs("tests/artifacts", exist_ok=True)
   with open("tests/artifacts/temp_callback_output.txt", "w") as f:
    f.write(data)
  def _recalculate_session_usage(self) -> None:
@@ -3014,9 +3015,9 @@ class App:
     entry = tool_log_filtered[i_minus_one]
     script = entry["script"]
     result = entry["result"]
+    first_line = script.split('\n')[0] if script else 'Empty Script'
     imgui.text_colored(C_KEY, f"Call #{i}: {first_line}")
-    # Script Display
-    imgui.text_colored(C_LBL, "Script:")
+    # Script Display    imgui.text_colored(C_LBL, "Script:")
     imgui.same_line()
     if imgui.button(f"[+]##script_{i}"):
      self.show_text_viewer = True