wasm scan demo: fetch the layout model that models-v1 actually hosts

The demo pointed at layout_heron_int8.onnx, but the release only hosts
the fp32 layout_heron.onnx (172 MB) — the int8 variant is produced
locally by scripts/install/quantize_models.py and was never uploaded,
so the page died on a 404 before ever becoming ready.

Refs #157

Signed-off-by: artiz <artem.kustikov@gmail.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EY5KAiquN4YpVf2PXEQkVT

Author: artiz

crates/docling-wasm/www/scan.html

@@ -41,7 +41,7 @@
   <h1>docling.rs → wasm: scanned PDF / image, full lite profile</h1>
   <p>
     Stage 2 of <a href="https://github.com/docling-project/docling.rs/issues/157">#157</a>:
-    RT-DETR layout detection (int8, ~165&nbsp;MB — cached after the first load)
+    RT-DETR layout detection (~172&nbsp;MB — cached after the first load)
     + PP-OCRv3 recognition via ONNX Runtime Web; pdf.js rasterizes PDF pages
     at the native pipeline's 2&nbsp;px/point; region refinement, OCR and
     reading-order assembly run in Rust/wasm — the same code as the native
@@ -70,8 +70,11 @@ <h1>docling.rs → wasm: scanned PDF / image, full lite profile</h1>
     pdfjs.GlobalWorkerOptions.workerSrc =
       "https://cdn.jsdelivr.net/npm/pdfjs-dist/build/pdf.worker.min.mjs";
 
+    // The models-v1 release hosts only the fp32 layout export (the int8
+    // variant is produced locally by scripts/install/quantize_models.py and
+    // was never uploaded) — fetch what is actually there.
     const LAYOUT_URL =
-      "https://github.com/docling-project/docling.rs/releases/download/models-v1/layout_heron_int8.onnx";
+      "https://github.com/docling-project/docling.rs/releases/download/models-v1/layout_heron.onnx";
     const SCALE = 2.0; // px per PDF point — the native pipeline's RENDER_SCALE
 
     const meta = document.getElementById("meta");
@@ -99,7 +102,7 @@ <h1>docling.rs → wasm: scanned PDF / image, full lite profile</h1>
     }
 
     // fetch() with a live "x / y MB" status line (falls back to a plain fetch
-    // when the body can't be streamed) — the 165 MB layout model would
+    // when the body can't be streamed) — the 172 MB layout model would
     // otherwise sit on a static message for minutes on a first visit.
     async function fetchProgress(url, label) {
       const resp = await fetch(url, { cache: "force-cache" });