Description

This PR adds code to

• Use classifier API to calculate sites topics
• Preserve the state of canvas on tab switches (regression)
• Keep the last node infobox open on pause, on tab switches
• First node visit should be instant, no delay
• Update cnn and cbs sports icon

Relevant Technical Choices

Testing Instructions

Additional Information:

Screenshot/Screencast

Checklist

• I have thoroughly tested this code to the best of my abilities.
• I have reviewed the code myself before requesting a review.
• This code is covered by unit tests to verify that it works as intended.
• The QA of this PR is done by a member of the QA team (to be checked by QA).

Partially addresses #856