Various fixes that complement and close the issues adressed in the last update.

Fixed a case where some titles would remain in screen.
Fixed memory accumulating infinitely with an automatic cleanup and a tight limit for optimal behavior.
Removed unnecesary refreshes that did not apply to the current endopint the user is looking at.
Various performance and architecture refactors for stability and performance.

Functionality extended to also pin A/B tested thumbnails, as well as video titles. Same idea, same logic, just extended to thumbnails.