Enhance theme management with dynamic discovery and macOS bundle support

- Updated CMake configuration to ensure theme files are included in macOS bundles and added explicit file handling for theme resources.
- Refactored ThemeManager to replace hardcoded theme lists with dynamic discovery of available themes, improving flexibility across development and deployment scenarios.
- Introduced methods for refreshing and loading themes at runtime, enhancing user experience and customization options.
- Improved logging for theme loading processes, providing better feedback on successes and failures.

src/CMakeLists.txt

@@ -32,6 +32,10 @@ set(YAZE_RESOURCE_FILES
   ${CMAKE_SOURCE_DIR}/assets/font/MaterialIcons-Regular.ttf
 )
 
+# Add theme files for macOS bundle (replacing the glob pattern with explicit files)
+file(GLOB YAZE_THEME_FILES "${CMAKE_SOURCE_DIR}/assets/themes/*.theme")
+list(APPEND YAZE_RESOURCE_FILES ${YAZE_THEME_FILES})
+
 foreach (FILE ${YAZE_RESOURCE_FILES})
   file(RELATIVE_PATH NEW_FILE "${CMAKE_SOURCE_DIR}/assets" ${FILE})
   get_filename_component(NEW_FILE_PATH ${NEW_FILE} DIRECTORY)