chore: update README

frontend/src/components/VegaChart.tsx

@@ -86,7 +86,7 @@ export const VegaChart: React.FC<VegaChartProps> = ({ data, spec }) => {
   };
 
   return (
-    <div className="w-full h-full min-h-[300px]" ref={containerRef}>
+    <div className="w-full h-full overflow-hidden" ref={containerRef}>
       <VegaEmbed 
         spec={vegaSpec} 
         options={{ actions: false }} 

frontend/src/pages/Dashboard.tsx

@@ -179,7 +179,7 @@ export function Dashboard() {
                   }
                   if (chart.chartSpec && rows.length > 0) {
                     return (
-                      <div className="h-full w-full rounded-xl border border-zinc-100 p-2">
+                      <div className="h-full w-full rounded-xl border border-zinc-100 p-2 overflow-hidden">
                         <VegaChart data={rows} spec={chart.chartSpec} />
                       </div>
                     );