fix: align useTableSort with PHP version — userClicked ref, nullable activeSort

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/admin/components/SortIcon.tsx

@@ -1,6 +1,6 @@
 interface SortIconProps {
   column: string
-  sort: string
+  sort: string | null
   order: string
 }
 

src/admin/hooks/useTableSort.ts

@@ -1,19 +1,23 @@
-import { useState, useCallback } from 'react'
+import { useState, useCallback, useRef } from 'react'
 
-export default function useTableSort(defaultSort = 'id') {
+export default function useTableSort(defaultSort = 'id', defaultOrder: 'asc' | 'desc' = 'desc') {
   const [sort, setSort] = useState(defaultSort)
-  const [order, setOrder] = useState<'asc' | 'desc'>('desc')
+  const [order, setOrder] = useState<'asc' | 'desc'>(defaultOrder)
+  const userClicked = useRef(false)
 
   const handleSort = useCallback((column: string) => {
+    userClicked.current = true
     setSort(prev => {
       if (prev === column) {
         setOrder(o => (o === 'asc' ? 'desc' : 'asc'))
-        return column
+        return prev
       }
       setOrder('desc')
       return column
     })
   }, [])
 
-  return { sort, order, handleSort, activeSort: sort }
+  const activeSort = userClicked.current ? sort : null
+
+  return { sort, order, handleSort, activeSort }
 }