[ai] dir streaming, still problems

src/DirectoryNode.cpp

@@ -578,6 +578,44 @@ String DirectoryNode::getDirectoryStructureHTML() const {
     return html;
 }
 
+void DirectoryNode::streamDirectoryHTML(Print &out) const {
+    if (name == "/") {
+        out.println(F("<ul>"));
+        delay(0); // yield to WiFi/other tasks
+    }
+
+    if (name != "/") {
+        out.print(F("<li data-id=\""));
+        out.print(id);
+        out.print(F("\"><b>"));
+        out.print(name);
+        out.println(F("</b></li>"));
+        delay(0); // yield periodically while streaming
+    }
+
+    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>"));
+        if ((i & 0x0F) == 0) { // yield every ~16 items
+            delay(0);
+        }
+    }
+
+    for (DirectoryNode* child : subdirectories) {
+        delay(0); // yield before descending
+        child->streamDirectoryHTML(out);
+        delay(0); // and after returning
+    }
+
+    if (name == "/") {
+        out.println(F("</ul>"));
+        delay(0);
+    }
+}
+
 // NEW: Calculate exact required size first
 size_t DirectoryNode::calculateHTMLSize() const {
     size_t size = 0;