feat(frontend): wire Vite app to FastAPI parser with NDJSON streaming + Upload page

src/components/AnimatedNumber.tsx

@@ -0,0 +1,18 @@
+import { useCountUp } from "@/hooks/useCountUp";
+
+interface AnimatedNumberProps {
+  value: number;
+  format: (n: number) => string;
+  duration?: number;
+  className?: string;
+}
+
+export function AnimatedNumber({
+  value,
+  format,
+  duration,
+  className,
+}: AnimatedNumberProps) {
+  const n = useCountUp(value, duration);
+  return <span className={className}>{format(n)}</span>;
+}