fix(llm): the document viewer ends its non-PDF paths by returning from one async flow instead of sentinel throws that surfaced as page errors

src/llm/web/pdf.html

@@ -186,6 +186,7 @@
       pdfjs = null;
     }
 
+    async function show() {
     // ── file list ──
     let files = [];
     try {
@@ -211,11 +212,7 @@
     }
     if (files.length > 1) sel.hidden = false;
     const current = files.find(f => f.name === wantFile) || files.find(f => f.renderable) || files[0];
-    // the "done:" throws below end this module on purpose once a non-PDF
-    // pane is up; keep the console quiet about them
-    window.addEventListener('unhandledrejection', ev => {
-      if (ev.reason && /^done: /.test(String(ev.reason.message || ev.reason))) ev.preventDefault();
-    });
+
     sel.value = current.name;
     const fileUrl = '/pdf/' + encodeURIComponent(key) + '/file?name=' + encodeURIComponent(current.name);
     $('download').href = fileUrl;
@@ -351,7 +348,7 @@
       const find = domFind(pre);
       nav.goTo(1, false);
       seedFind(find);
-      throw new Error('done: text');  // the module's PDF path below must not run
+      return;
     }
 
     // ── Word (.docx) via docx-preview: sections become pages; zoom scales
@@ -414,7 +411,7 @@
       const hashPage = parseInt((location.hash.match(/page=(\d+)/) || [])[1] || '0', 10);
       nav.goTo(hashPage || wantPage, false);
       seedFind(find);
-      throw new Error('done: docx');  // stop before the PDF path
+      return;
     }
 
     if (!pdfjs) {
@@ -666,6 +663,8 @@
       $('find').value = probe;
       runFind(probe);
     }
+    }
+    show().catch(e => console.warn('viewer:', e && e.message || e));
   </script>
 </body>
 </html>