fix(rack): ensure dnd-kit DragOverlay ignores pointer events to fix hit-testing

client/src/components/rack/DevicePalette.tsx

@@ -27,7 +27,7 @@ function PaletteItem({ type }: { type: ModuleType }) {
       {...listeners}
       {...attributes}
       className={cn(
-        'flex items-center gap-2 px-2 py-1.5 rounded border text-left w-full cursor-grab active:cursor-grabbing transition-all select-none',
+        'flex items-center gap-2 px-2 py-1.5 rounded border text-left w-full cursor-grab active:cursor-grabbing transition-all select-none touch-none',
         colors.bg,
         colors.border,
         isDragging ? 'opacity-40' : 'hover:brightness-125'

client/src/components/rack/RackPlanner.tsx

@@ -277,7 +277,7 @@ export function RackPlanner() {
         </div>
       </div>
 
-      <DragOverlay dropAnimation={null}>
+      <DragOverlay dropAnimation={null} className="pointer-events-none" zIndex={999} style={{ pointerEvents: 'none' }}>
         {activePaletteType && <DragOverlayItem type={activePaletteType} />}
         {activeDragModuleLabel && <ModuleDragOverlay label={activeDragModuleLabel} />}
       </DragOverlay>