feat: add Xteink X3 hardware support

Adds HAL-level support for the Xteink X3 (SSD1677 controller, 792x528
display). Includes device detection, display initialization, button
mapping, power management, and theme adjustments for the X3 form factor.

lib/Epub/Epub/converters/ImageToFramebufferDecoder.h

@@ -37,4 +37,4 @@ class ImageToFramebufferDecoder {
 
   bool validateImageDimensions(int width, int height, const std::string& format);
   void warnUnsupportedFeature(const std::string& feature, const std::string& imagePath);
-};
+};