fix: convert empty numeric fields to null before insert/update orders

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

src/admin/orders/OrderModal.jsx

@@ -73,6 +73,13 @@ const OrderModal = ({ order, onClose, onSaved, mode = 'edit' }) => {
 
   const set = (e) => setForm((prev) => ({ ...prev, [e.target.name]: e.target.value }));
 
+  const toPayload = (f) => ({
+    ...f,
+    area_sqm: f.area_sqm === '' ? null : Number(f.area_sqm),
+    estimated_cost: f.estimated_cost === '' ? null : Number(f.estimated_cost),
+    final_cost: f.final_cost === '' ? null : Number(f.final_cost),
+  });
+
   const handleSave = async () => {
     if (!form.name.trim() || !form.phone.trim()) {
       setError('Имя и телефон обязательны');
@@ -85,11 +92,11 @@ const OrderModal = ({ order, onClose, onSaved, mode = 'edit' }) => {
     if (mode === 'create') {
       const { error } = await supabase
         .from('orders')
-        .insert({ ...form, source: 'manual' });
+        .insert({ ...toPayload(form), source: 'manual' });
       if (error) { setError(error.message); setSaving(false); return; }
     } else {
       const statusChanged = form.status !== order.status;
-      const updates = { ...form };
+      const updates = { ...toPayload(form) };
       if (statusChanged) {
         if (form.status === 'закрыт') {
           updates.closed_at = new Date().toISOString();