Show TB for sizes >= 1 TiB in humanSize formatter

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/renderer/App.tsx

@@ -131,7 +131,8 @@ function humanSize(bytes: number): string {
   if (bytes < 1024) { return `${bytes} B`; }
   if (bytes < 1024 * 1024) { return `${(bytes / 1024).toFixed(1)} KB`; }
   if (bytes < 1024 * 1024 * 1024) { return `${(bytes / (1024 * 1024)).toFixed(2)} MB`; }
-  return `${(bytes / (1024 * 1024 * 1024)).toFixed(2)} GB`;
+  if (bytes < 1024 * 1024 * 1024 * 1024) { return `${(bytes / (1024 * 1024 * 1024)).toFixed(2)} GB`; }
+  return `${(bytes / (1024 * 1024 * 1024 * 1024)).toFixed(3)} TB`;
 }
 
 interface BandwidthChartProps {