Fix issue #2096: Handle URLs with embedded HTTP credentials in _load_image

[nMaroulis]

References:
Fixes Issue #2096

Overview:
Fixes an issue where _load_image fails on URLs containing HTTP credentials (e.g., http://user:[email protected]/image.jpg) and raises http.client.InvalidURL.

Solution:

• Detect URLs with embedded credentials.
• Use HTTPPasswordMgrWithDefaultRealm + HTTPBasicAuthHandler from urllib.request.
• Strip credentials from the URL before opening.
• Imports remain inside the function to match library style.

Test plan:
Verified that _load_image now works with:

• Normal URLs
• URLs with embedded credentials
• data: URLs