Release 4.2.0

Simplify scope filter checkboxes - use only Right sidebar

The code was referencing non-existent left sidebar checkboxes
(scopeRequired, scopeOptional, scopeExcluded) but only the Right
sidebar versions actually exist in the HTML. This caused the excluded
filter to never work.

Simplified by:
- Reading directly from scopeRequiredRight/OptionalRight/ExcludedRight
- Removing unnecessary sync logic since there's only one set
- Fixing all references throughout the code

Much simpler and actually works now.