fix: use native navigation for file downloads to support large files

dashboard/frontend/src/lib/api.js

@@ -217,14 +217,8 @@ export async function download(path, filename) {
 
     const { token: downloadToken } = await tokenResponse.json();
 
-    // Use the token to trigger browser download (no memory loading)
-    const downloadUrl = `${BASE}/files/download?token=${downloadToken}`;
-    const a = document.createElement("a");
-    a.href = downloadUrl;
-    a.download = filename;
-    document.body.appendChild(a);
-    a.click();
-    document.body.removeChild(a);
+    // Navigate directly to download URL - browser handles streaming natively
+    window.location.href = `${BASE}/files/download?token=${downloadToken}`;
   } catch (e) {
     console.error("Download error:", e);
     throw e;