fix: move inspection action buttons above barcode input; split checked_at into date/time rows

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

frontend/app.js

@@ -312,6 +312,11 @@ createApp({
       const d = new Date(dateStr);
       return d.toLocaleTimeString('ru-RU', { hour: '2-digit', minute: '2-digit' });
     },
+    formatDateOnly(dateStr) {
+      if (!dateStr) return '';
+      const d = new Date(dateStr);
+      return d.toLocaleDateString('ru-RU');
+    },
     async loadEquipmentTypes() {
       try {
         this.equipmentTypes = await fetchJSON('/equipment-types/');