main heatmap component + download functionality working

Author: druvkotwani

client/package.json

@@ -13,6 +13,7 @@
     "@vercel/analytics": "^1.3.1",
     "@vercel/speed-insights": "^1.0.12",
     "axios": "^1.7.3",
+    "html2canvas": "^1.4.1",
     "mongoose": "^8.5.2",
     "next": "14.2.5",
     "react": "^18",