Add lens bokeh preview panel

src/App.jsx

@@ -133,6 +133,62 @@ const filterDatasetForPlotType = (dataset, plotType) => {
   return dataset;
 };
 
+const PreviewPanel = ({ lensCurves }) => {
+  const previewItems = lensCurves.map((curve) => {
+    const infinityStat = curve.checkpointStats.find((stat) => !Number.isFinite(stat.separation));
+    const blurPercent = infinityStat?.blurPercentOfDiagonal ?? 0;
+
+    return {
+      lens: curve.lens,
+      blurPercent,
+      colorIndex: curve.colorIndex,
+    };
+  });
+
+  const maxBlurPercent = previewItems.reduce((maxValue, item) => Math.max(maxValue, item.blurPercent), 0);
+  const denominator = maxBlurPercent > 0 ? maxBlurPercent : 1;
+
+  return (
+    <div className="rounded-lg border border-slate-800 bg-slate-900/60 p-4">
+      <h2 className="mb-3 text-sm font-semibold uppercase tracking-wide text-slate-400">Bokeh preview</h2>
+      {previewItems.length === 0 ? (
+        <div className="text-sm text-slate-500">Select at least one lens to preview its blur at infinity.</div>
+      ) : (
+        <div className="flex flex-wrap justify-center gap-4">
+          {previewItems.map((item) => {
+            const normalized = Math.min(item.blurPercent / denominator, 1);
+            const diameter = Math.max(18, 30 + normalized * 70);
+            const paletteColor = COLOR_PALETTE[item.colorIndex % COLOR_PALETTE.length];
+
+            return (
+              <div key={item.lens.id} className="flex w-32 flex-col items-center gap-2 text-center">
+                <div
+                  className="flex items-center justify-center rounded-full border"
+                  style={{
+                    width: `${diameter}px`,
+                    height: `${diameter}px`,
+                    borderColor: paletteColor,
+                    background: `${paletteColor}1A`,
+                    boxShadow: `0 0 12px ${paletteColor}33`,
+                  }}
+                >
+                  <span className="sr-only">{item.lens.name}</span>
+                </div>
+                <div className="text-xs text-slate-200">
+                  <div className="font-medium text-slate-100">{item.lens.name}</div>
+                  <div className="text-[10px] uppercase tracking-wide text-slate-500">
+                    ∞ blur {formatNumber(item.blurPercent, 2)}%
+                  </div>
+                </div>
+              </div>
+            );
+          })}
+        </div>
+      )}
+    </div>
+  );
+};
+
 const PlotSection = ({ lensCurves, plotType, setPlotType }) => {
   const axisConfig = getAxisConfig(plotType);
 
@@ -704,6 +760,7 @@ const App = () => {
           />
 
           <div className="space-y-6 px-4 pb-6 lg:hidden">
+            <PreviewPanel lensCurves={lensCurves} />
             <FramingPanel
               framingMode={framingMode}
               setFramingMode={setFramingMode}
@@ -741,6 +798,7 @@ const App = () => {
 
         <aside className="hidden w-full max-w-xs border-l border-slate-900/60 bg-slate-950/60 lg:block">
           <div className="space-y-6 px-4 py-6">
+            <PreviewPanel lensCurves={lensCurves} />
             <FramingPanel
               framingMode={framingMode}
               setFramingMode={setFramingMode}