feat: Add touch coordinate mapping and RTOS task yielding (#2481)

Co-authored-by: Julia Nguyen <julia@uxj.io>

lib/Xtc/Xtc.cpp

@@ -10,6 +10,16 @@
 #include <Bitmap.h>
 #include <HalStorage.h>
 #include <Logging.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+
+namespace {
+void yieldDuringThumbnail(uint8_t& rowsSinceYield) {
+  if (++rowsSinceYield < 8) return;
+  rowsSinceYield = 0;
+  vTaskDelay(1);
+}
+}  // namespace
 
 bool Xtc::load() {
   LOG_DBG("XTC", "Loading XTC: %s", filepath.c_str());
@@ -380,6 +390,7 @@ bool Xtc::generateThumbBmp(int height) const {
   const uint8_t* plane2 = (bitDepth == 2) ? pageBuffer + planeSize : nullptr;
   const size_t colBytes = (bitDepth == 2) ? ((pageInfo.height + 7) / 8) : 0;
   const size_t srcRowBytes = (bitDepth == 1) ? ((pageInfo.width + 7) / 8) : 0;
+  uint8_t rowsSinceYield = 0;
 
   for (uint16_t dstY = 0; dstY < thumbHeight; dstY++) {
     memset(rowBuffer, 0xFF, rowSize);  // Start with all white (bit 1)
@@ -471,6 +482,7 @@ bool Xtc::generateThumbBmp(int height) const {
 
     // Write row (already padded to 4-byte boundary by rowSize)
     thumbBmp.write(rowBuffer, rowSize);
+    yieldDuringThumbnail(rowsSinceYield);
   }
 
   free(rowBuffer);