feat(ideas): sorted useMemo + tabel-render koppelen (ST-cmotjj9uf000104l5i70so19b)

- Voeg sorted useMemo toe na filtered: locale-aware sort met STATUS_SORT_ORDER
- Ideeën zonder product sorteren achteraan bij oplopende productsortering
- Vervang filtered.length/filtered.map door sorted in tabel-render

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/ideas/idea-list.tsx

@@ -154,6 +154,26 @@ export function IdeaList({ ideas, products, isDemo }: IdeaListProps) {
     })
   }, [ideas, search, productFilter, statusFilter, sortKey, sortDir])
 
+  const sorted = useMemo(() => {
+    return [...filtered].sort((a, b) => {
+      let cmp = 0
+      if (sortKey === 'code') {
+        cmp = (a.code ?? '').localeCompare(b.code ?? '', 'nl', { numeric: true })
+      } else if (sortKey === 'title') {
+        cmp = a.title.localeCompare(b.title, 'nl')
+      } else if (sortKey === 'product') {
+        const aN = a.product?.name ?? ''
+        const bN = b.product?.name ?? ''
+        if (!aN && bN) return sortDir === 'asc' ? 1 : -1
+        if (aN && !bN) return sortDir === 'asc' ? -1 : 1
+        cmp = aN.localeCompare(bN, 'nl')
+      } else {
+        cmp = (STATUS_SORT_ORDER[a.status] ?? 99) - (STATUS_SORT_ORDER[b.status] ?? 99)
+      }
+      return sortDir === 'asc' ? cmp : -cmp
+    })
+  }, [filtered, sortKey, sortDir])
+
   function handleSort(col: SortKey) {
     if (sortKey === col) {
       setSortDir((d) => (d === 'asc' ? 'desc' : 'asc'))
@@ -316,7 +336,7 @@ export function IdeaList({ ideas, products, isDemo }: IdeaListProps) {
       )}
 
       {/* Tabel */}
-      {filtered.length === 0 ? (
+      {sorted.length === 0 ? (
         <p className="text-sm text-muted-foreground py-8 text-center">
           {ideas.length === 0
             ? 'Nog geen ideeën — start hierboven met "Nieuw idee".'
@@ -334,7 +354,7 @@ export function IdeaList({ ideas, products, isDemo }: IdeaListProps) {
             </TableRow>
           </TableHeader>
           <TableBody>
-            {filtered.map((idea) => {
+            {sorted.map((idea) => {
               const badge = getIdeaStatusBadge(API_TO_DB[idea.status])
               return (
                 <TableRow