fix(design-preview): отступ под горизонтальным скроллом таблиц

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

apps/web/src/design-preview/section-grid.tsx

@@ -215,7 +215,7 @@ export function PreviewSectionGrid<T extends object>({
             </>
           ) : null}
           <DataGridScrollArea>
-            <div style={{ minWidth }}>
+            <div className="pb-3" style={{ minWidth }}>
               <DataGridTable />
             </div>
           </DataGridScrollArea>