feat(popup): add email capture popup with Mautic integration

- Email capture popup with scroll (10%) and exit intent triggers
- First name field and full tracking (UTM, device, time on page)
- Mautic API integration for contact creation
- GeoIP detection for country/region
- 4 locale support (sr, en, de, fr)
- Mautic tracking script in layout

src/hooks/useExitIntent.ts

@@ -0,0 +1,21 @@
+"use client";
+
+import { useEffect, useState } from "react";
+
+export function useExitIntent(): boolean {
+  const [showExitIntent, setShowExitIntent] = useState(false);
+
+  useEffect(() => {
+    const handleMouseLeave = (e: MouseEvent) => {
+      if (e.clientY <= 0) {
+        setShowExitIntent(true);
+      }
+    };
+
+    document.addEventListener("mouseleave", handleMouseLeave);
+    
+    return () => document.removeEventListener("mouseleave", handleMouseLeave);
+  }, []);
+
+  return showExitIntent;
+}