Reintroduce newlines via multiple text flags

src/graphics/LabelBuilder.cpp

@@ -31,6 +31,10 @@ LabelBuilder::LabelBuilder(int printerHeight) : mPrinterHeight(printerHeight) {
 
 ILabelBuilder& LabelBuilder::addText(const std::string& text) {
     if (!text.empty()) {
+        if (!mAccumulatedText.empty()) {
+            // Add a newline if the label already has some text accumulated
+            mAccumulatedText += '\n';
+        }
         mAccumulatedText += text;
         spdlog::debug("LabelBuilder: Added text '{}', total length: {}", text, mAccumulatedText.length());
     }