* feat(ui-shell): refactor UI Shell search component
* fix(ui-shell): dispatched event is "select", not "search"
* test(header-search): validate HeaderSearch types
* fix(header-search): selecting a result should reset the search
* feat(header-search): deefault selectedResultIndex should be 0
Reset selectedResultIndex, value after dispatching.
* docs(header-search): demo basic filtering
* chore: rebuild types, docs
* feat(header-search): pass index as a slot prop
