Validate file download after clicking download

[Naseem77]

Title: Validate file download after clicking download

Preconditions:
The CodeGraph page is accessible.
A valid graph is available for interaction.

Test Steps:
Navigate to the CodeGraph page.
Select a graph to interact with.
Click on the download button.
Capture the download event.
Verify that the downloaded file is saved successfully.

Expected Result:
Clicking the download button should trigger the file download.