fix(listview): address kgabryje review — regressions, ARIA, cleanup

🔴 Regressions fixed:
- CompactSelectPanel: bump async fetch cap 50→200 (pagination workaround)
- CompactSelectPanel: accept panelStyle prop forwarded from filter popupStyle
- CardSortSelect: fix hardcoded hasValue=false; show active sort in pill label;
  onClear resets to default sort option
- index.tsx: remove double updateFilterValue on datetime/numerical_range clear
- index.tsx: tooltip cold-load fallback — resolve label from static selects
  when cache is empty (URL round-trip strips label from internalFilters)
- index.tsx: format unix timestamps in date tooltip as "MMM D, YYYY HH:mm"
  instead of raw ms numbers

🟡 Correctness / UX:
- CompactFilterTrigger: move × out of <button> into sibling ClearButton with
  aria-label="Clear {filter} filter" — fixes nested-interactive ARIA violation,
  adds proper tab stop, meets WCAG 2.5.5 target size (min 24×24)
- CompactFilterTrigger: replace cloneElement injection with render prop
  children: (props: { isOpen, onClose }) => ReactNode — removes single-child
  constraint and eliminates FilterPopoverContent's isOpen hack prop

🟢 Cleanup:
- CompactSelectPanel: extract SEARCH_THRESHOLD constant; remove redundant
  selectedOption local state (use value prop directly); add ArrowUp/ArrowDown
  key navigation between listbox options
- index.tsx: extract clearFilterAtIndex helper; eliminate duplicated clear logic
  in clearFilterById and select onClear
- FilterPopoverContent: remove unused isOpen? prop