Replace the sort <select> dropdowns on the invoice, quote and contract
list pages with clickable column headers that toggle asc/desc and show a
chevron indicator. Adds a shared SortableHeader component + useColumnSort
hook that maps clickable columns onto the server-side sort enum.
Make issue date (newest first) the standard sort on all three lists,
set at the frontend, route and service layers. Adds issue_asc/issue_desc
to invoices and an "Issued" column to the bills table so the default is
visible and toggleable. Extends sort coverage so every clickable column
has both directions (+customer_desc on all; +issue_asc/desc on
quotes/contracts). Storno rows remain listed.
Luca
d9251c0850