Add FFT and powerspectrum band

Author: Amanmahe

package-lock.json

@@ -34,11 +34,13 @@
     "clsx": "^2.1.1",
     "embla-carousel-react": "^8.1.5",
     "esc-pos-encoder": "^2.0.1",
+    "fft-js": "^0.0.12",
     "file-saver": "^2.0.5",
     "framer-motion": "^11.5.4",
     "html2canvas": "^1.4.1",
     "jszip": "^3.10.1",
     "lucide-react": "^0.460.0",
+    "mathjs": "^14.3.0",
     "next": "14.2.21",
     "next-themes": "^0.3.0",
     "react": "^18",