wifi timeouts, small changes for sd card access

src/DirectoryNode.cpp

@@ -550,16 +550,20 @@ void DirectoryNode::streamDirectoryHTML(Print &out) const {
         out.print(F("\"><b>"));
         out.print(name);
         out.println(F("</b></li>"));
+        delay(0);  // Yield to allow network stack to send buffered data
     }
 
-    delay(0);
-
     for (size_t i = 0; i < mp3Files.size(); i++) {
         out.print(F("<li data-id=\""));
         out.print(ids[i]);
         out.print(F("\">"));
         out.print(mp3Files[i]);
         out.println(F("</li>"));
+        
+        // Yield every few items to allow the async web server to send buffered data
+        if (i % 5 == 4) {
+            delay(1);
+        }
     }
 
     for (DirectoryNode* child : subdirectories) {
@@ -568,6 +572,7 @@ void DirectoryNode::streamDirectoryHTML(Print &out) const {
 
     if (name == "/") {
         out.println(F("</ul>"));
+        delay(0);  // Final yield before completing
     }
 }