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.

test/unit/gui/canvas_automation_api_test.cc

@@ -3,7 +3,7 @@
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 
-#include "app/gui/canvas.h"
+#include "app/gui/canvas/canvas.h"
 #include "testing.h"
 
 namespace yaze {

test/unit/gui/canvas_coordinate_sync_test.cc

@@ -1,4 +1,4 @@
-#include "app/gui/canvas.h"
+#include "app/gui/canvas/canvas.h"
 
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>

test/unit/gui/tile_selector_widget_test.cc

@@ -4,7 +4,7 @@
 #include <gtest/gtest.h>
 
 #include "app/gfx/core/bitmap.h"
-#include "app/gui/canvas.h"
+#include "app/gui/canvas/canvas.h"
 #include "testing.h"
 
 namespace yaze {