Fix sd card font performance for txt + md

src/activities/reader/MdReaderActivity.cpp

@@ -613,6 +613,12 @@ bool MdReaderActivity::loadPageAtOffset(size_t offset, bool startInCodeBlock, st
         }
       }
 
+      if (renderer.isSdCardFont(cachedFontId)) {
+        std::string flatText;
+        for (const auto& span : flatLine.spans) flatText += span.text;
+        renderer.ensureSdCardFontReady(cachedFontId, flatText.c_str());
+      }
+
       size_t linesBefore = outLines.size();
       int remainingLines = linesPerPage - static_cast<int>(outLines.size());
       bool fullyConsumed = wordWrapParsedLine(flatLine, 0, outLines, remainingLines);

src/activities/reader/TxtReaderActivity.cpp

@@ -45,6 +45,8 @@ size_t parseAndWrapLines(const uint8_t* buffer, size_t chunkSize, size_t fileOff
     std::string line(reinterpret_cast<const char*>(buffer + pos), displayLen);
     size_t lineBytePos = 0;
 
+    renderer.ensureSdCardFontReady(fontId, line.c_str());
+
     while (!line.empty() && static_cast<int>(outLines.size()) < linesPerPage) {
       if (renderer.getTextWidth(fontId, line.c_str()) <= vw) {
         outLines.push_back(line);