Feature/cover crop mode (#225)

Added a setting to select `fit` or `crop` for cover image on sleep
screen.

Might add a `expand` feature in the future that does not crop but rather
fills the blank space with a mirror of the image.

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Co-authored-by: Dave Allie <dave@daveallie.com>

lib/JpegToBmpConverter/JpegToBmpConverter.cpp

@@ -468,7 +468,9 @@ bool JpegToBmpConverter::jpegFileToBmpStream(FsFile& jpegFile, Print& bmpOut) {
     // Calculate scale to fit within target dimensions while maintaining aspect ratio
     const float scaleToFitWidth = static_cast<float>(TARGET_MAX_WIDTH) / imageInfo.m_width;
     const float scaleToFitHeight = static_cast<float>(TARGET_MAX_HEIGHT) / imageInfo.m_height;
-    const float scale = (scaleToFitWidth < scaleToFitHeight) ? scaleToFitWidth : scaleToFitHeight;
+    // We scale to the smaller dimension, so we can potentially crop later.
+    // TODO: ideally, we already crop here.
+    const float scale = (scaleToFitWidth > scaleToFitHeight) ? scaleToFitWidth : scaleToFitHeight;
 
     outWidth = static_cast<int>(imageInfo.m_width * scale);
     outHeight = static_cast<int>(imageInfo.m_height * scale);