add download progress for HRM-Text and fix error handling

- Stream HRM ONNX download with progress percentage and MB count
- Hide loading overlay on error instead of leaving it stuck
- Reset activeModel on error so retry works

index.html

@@ -474,8 +474,32 @@
     showLoading('HRM-Text', '~94 MB ONNX (one-time download)');
     try {
       loadingText.textContent = 'Downloading HRM-Text...';
+      const response = await fetch(HRM_ONNX_URL);
+      if (!response.ok) throw new Error(`HTTP ${response.status}`);
+      const total = parseInt(response.headers.get('content-length') || '0', 10);
+      const reader = response.body.getReader();
+      const chunks = [];
+      let loaded = 0;
+      while (true) {
+        const { done, value } = await reader.read();
+        if (done) break;
+        chunks.push(value);
+        loaded += value.length;
+        if (total > 0) {
+          const pct = Math.round((loaded / total) * 100);
+          const mb = (loaded / 1048576).toFixed(1);
+          loadingText.textContent = `Downloading HRM-Text... ${pct}% (${mb} MB)`;
+        }
+      }
+      const buffer = new Uint8Array(loaded);
+      let offset = 0;
+      for (const chunk of chunks) {
+        buffer.set(chunk, offset);
+        offset += chunk.length;
+      }
+      loadingText.textContent = 'Initializing HRM-Text...';
       const ortLib = await getOrt();
-      hrmSession = await ortLib.InferenceSession.create(HRM_ONNX_URL, {
+      hrmSession = await ortLib.InferenceSession.create(buffer.buffer, {
         executionProviders: ['wasm'],
       });
     } catch (err) {
@@ -564,7 +588,9 @@
       hideLoading();
       analyzeBtn.disabled = false;
     } catch (err) {
-      updateBadge('Error');
+      updateBadge('Error — click model to retry');
+      hideLoading();
+      activeModel = null;
     }
 
     isLoading = false;