Creating an accessible search experience with the QueryBuilder component

Introduced the QueryBuilder component, a fully accessible component designed for complex search inputs with filtering capabilities. Detailed accessibility considerations including semantics (Combobox pattern), styled input implementation using a hidden div and spans, handling items with different actions ('Jump to' vs. 'Autocomplete') via aria-labels, group support with visual headers and screen reader specific aria-labels, and screen reader feedback using aria-live regions for suggestion counts and input clearing.