fix: resolve chart visibility issues after CSV upload

- Add fixed width to sidebar (w-64) to prevent layout collapse
- Change chart container from flex-1 to w-full h-full for proper sizing
- Chart now properly displays after CSV upload

src/components/CandleChart.tsx

@@ -266,7 +266,7 @@ const CandleChart = forwardRef<CandleChartHandle, CandleChartProps>(
     }
 
     return (
-      <div className="flex-1 relative">
+      <div className="w-full h-full relative">
         <div ref={chartContainerRef} className="absolute inset-0" />
         <SvgOverlay
           chart={chartRef.current}