refactor(gui): reorganize GUI includes and introduce new components

- Updated include paths for various GUI-related headers to improve organization and clarity.
- Introduced new components for better modularity, including PaletteEditorWidget and EditorCardManager.
- Refactored existing code to utilize the new components, ensuring consistency across the GUI subsystem.

Benefits:
- Enhances maintainability and readability of the GUI code.
- Facilitates future enhancements and optimizations within the GUI subsystem.

src/app/editor/ui/editor_selection_dialog.cc

@@ -6,8 +6,8 @@
 
 #include "absl/strings/str_cat.h"
 #include "imgui/imgui.h"
-#include "app/gui/icons.h"
-#include "app/gui/style.h"
+#include "app/gui/core/icons.h"
+#include "app/gui/core/style.h"
 #include "util/file_util.h"
 
 namespace yaze {