fix(listview): one search box per page, fixed 176px width, CardSortSelect pinned right

- Only the first search filter renders; subsequent search filters on pages
  like UsersList (which have 5 search inputs) are skipped to keep one
  search box per page.
- Search container uses fixed width (sizeUnit*44 = 176px) with flex-shrink:0
  instead of flex:1, so it never resizes when a scrollbar appears or
  pills wrap (fixes Sophie's resize-on-scroll bug).
- CardSortSelect in card/thumbnail view gets margin-left:auto so it pins
  to the right edge of the controls row instead of orphaning on a new line.