fixes filename encoding

uploader_test.html

@@ -107,16 +107,18 @@
         const hashHex = await computeSHA256(file);
         appendLog(`Computed SHA-256 hash: ${hashHex}`);
   
-        // Prepare the POST request with file as body and header X-Content-SHA256
+              // Prepare the POST request with file as body and additional header for filename
+        const encodedFileName = btoa(unescape(encodeURIComponent(file.name)));
         const response = await fetch(BASE_URL, {
           method: "POST",
           headers: {
             "X-Content-SHA256": hashHex,
-            "X-File-Name": file.name, // NEW: передаём имя файла
+            "X-File-Name": encodedFileName, // NEW: передаём имя файла в base64
             "Content-Type": file.type || "application/octet-stream"
           },
           body: file
         });
+
   
         if (!response.ok) {
           const errorData = await response.json();