fix(gui): stabilize Tk image ownership and add tuning report seed file

Fix Tk image lifecycle issues in the base window to avoid icon/image fallback
and missing-image runtime errors:
- keep a persistent PhotoImage reference for window iconphoto
- bind buffered PhotoImage instances to the target parent widget

Author: amilcarlucas

ardupilot_methodic_configurator/frontend_tkinter_base_window.py

@@ -140,7 +140,8 @@ def _setup_application_icon(self) -> None:
         # https://pythonassets.com/posts/window-icon-in-tk-tkinter/
         try:
             icon_path = ProgramSettings.application_icon_filepath()
-            self.root.iconphoto(True, tk.PhotoImage(file=icon_path))  # noqa: FBT003
+            self._icon_photo = tk.PhotoImage(master=self.root, file=icon_path)
+            self.root.iconphoto(True, self._icon_photo)  # noqa: FBT003
         except (tk.TclError, FileNotFoundError) as e:
             # Silently ignore icon loading errors (common in test environments)
             logging_error(_("Could not load application icon: %s"), e)
@@ -524,7 +525,7 @@ def put_image_in_label(  # pylint: disable=too-many-locals
                 buffer.seek(0)
 
                 # Create PhotoImage from buffer
-                photo = tk.PhotoImage(data=buffer.getvalue())
+                photo = tk.PhotoImage(master=parent, data=buffer.getvalue())
 
             if is_debugging():
                 return ttk.Label(parent)  # the vscode debugger can not cope with the images

tests/test_frontend_tkinter_base_window.py

@@ -301,7 +301,7 @@ def test_user_sees_properly_sized_images(self, image_test_context, sample_image_
             mocks["open_mock"].assert_called_once_with(sample_image_file)
             mocks["image"].resize.assert_called_once()
             # Check that PhotoImage was called with data parameter (our new implementation)
-            mocks["photo_mock"].assert_called_once_with(data=b"fake_png_data")
+            mocks["photo_mock"].assert_called_once_with(master=parent_frame, data=b"fake_png_data")
 
     def test_user_sees_fallback_when_image_unavailable(self, image_test_context, mocked_base_window) -> None:
         """