Fix map tiles blocked by COEP: use credentialless instead of require-corp

Cross-Origin-Embedder-Policy: require-corp blocks OpenStreetMap tiles and
Leaflet marker icons (from unpkg.com) because they don't send CORP headers.
Switching to credentialless still enables SharedArrayBuffer for ONNX WASM
but allows cross-origin resources that don't use credentials.

Author: Partha-dev01

next.config.ts

@@ -43,7 +43,7 @@ const nextConfig: NextConfig = {
         source: "/(.*)",
         headers: [
           { key: "Cross-Origin-Opener-Policy", value: "same-origin" },
-          { key: "Cross-Origin-Embedder-Policy", value: "require-corp" },
+          { key: "Cross-Origin-Embedder-Policy", value: "credentialless" },
         ],
       },
     ];