feat(wizard): add search filter to admin partner select

shop/components/wizard/step-customer.tsx

@@ -60,6 +60,17 @@ export function StepCustomer({
   const [pageSize, setPageSize] = useState<number>(10)
   const [currentPage, setCurrentPage] = useState<number>(1)
 
+  const [partnerSearchTerm, setPartnerSearchTerm] = useState('')
+
+  // Filter partner companies by partnerSearchTerm
+  const filteredCompanies = useMemo(() => {
+    const term = partnerSearchTerm.toLowerCase().trim()
+    if (!term) return companies
+    return companies.filter((c: any) =>
+      c.name?.toLowerCase().includes(term) || c.id?.toLowerCase().includes(term)
+    )
+  }, [companies, partnerSearchTerm])
+
   // Reset page to 1 when search or company filter or pageSize changes
   useEffect(() => {
     setCurrentPage(1)
@@ -108,13 +119,23 @@ export function StepCustomer({
         </CardDescription>
       </CardHeader>
       <CardContent className="space-y-6">
-        {/* Admin Partner Dropdown */}
+        {/* Admin Partner Dropdown with Search */}
         {isAdmin && (
           <div className="p-4 rounded-xl bg-white/5 border border-white/10 space-y-3">
             <Label htmlFor="order-company" className="text-white font-medium flex items-center gap-2">
               <Building2 className="w-4 h-4 text-primary" />
               Partner-Auswahl (Admin-Funktion)
             </Label>
+            <div className="space-y-2">
+              <div className="relative">
+                <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-400" />
+                <Input
+                  placeholder="Partner suchen..."
+                  value={partnerSearchTerm}
+                  onChange={(e) => setPartnerSearchTerm(e.target.value)}
+                  className="pl-9 bg-slate-900 border-white/10 text-white placeholder:text-slate-500 focus:border-primary text-sm h-9"
+                />
+              </div>
               <select
                 id="order-company"
                 value={selectedCompanyId || 'all'}
@@ -122,13 +143,14 @@ export function StepCustomer({
                 className="flex h-10 w-full rounded-md border border-white/10 bg-slate-900 px-3 py-1 text-sm shadow-sm transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-primary text-white"
               >
                 <option value="all">Alle Partner (Firmenübergreifend)</option>
-              {companies.map((c: any) => (
+                {filteredCompanies.map((c: any) => (
                   <option key={c.id} value={c.id}>
                     {c.name}
                   </option>
                 ))}
               </select>
             </div>
+          </div>
         )}
 
         {/* Modus-Toggle */}