fix: #348 fit cover artifacts 2 (#465)

Supersedes #358 and includes the bugfix from #351

src/activities/boot_sleep/SleepActivity.cpp

@@ -260,6 +260,7 @@ void SleepActivity::renderCoverSleepScreen() const {
   if (SdMan.openFileForRead("SLP", coverBmpPath, file)) {
     Bitmap bitmap(file);
     if (bitmap.parseHeaders() == BmpReaderError::Ok) {
+      Serial.printf("[SLP] Rendering sleep cover: %s\n", coverBmpPath);
       renderBitmapSleepScreen(bitmap);
       return;
     }