Changing sort updates results without losing filters or pagination

When changing sort order wipes active filters, the user watches their carefully refined query collapse back to the unfiltered state in one click. They rebuild the filters, sort again, and it collapses again — or they give up. This is a state-management bug that reads to the user as the directory being fundamentally unreliable. Sort is a refinement of the existing result set, not a reset, and confusing the two guarantees the user never trusts the interface enough to commit to a listing.

Update the sort query parameter by cloning the existing URLSearchParams, setting only sort and resetting page to 1, then calling router.push. Do not construct a new params object from scratch. Edit components/SortControl.tsx:

const params = new URLSearchParams(searchParams)
params.set('sort', newSort)
params.set('page', '1')
router.push(`?${params}`)

This preserves category, price, and every other active filter.