refactor(editor): remove EditorCardManager references from various editors

- Eliminated the inclusion of EditorCardManager from multiple editor header files, streamlining dependencies and reducing coupling.
- Updated comments in PaletteEditor to reflect the transition to EditorCardRegistry for card management.

Benefits:
- Enhances modularity by decoupling editor components from the centralized card manager.
- Improves maintainability and clarity in the codebase by aligning with the new card management approach.

src/app/editor/graphics/graphics_editor.h

@@ -7,7 +7,6 @@
 #include "app/editor/editor.h"
 #include "app/editor/palette/palette_editor.h"
 #include "app/gfx/core/bitmap.h"
-#include "app/gui/app/editor_card_manager.h"
 #include "app/gfx/types/snes_tile.h"
 #include "app/gui/canvas/canvas.h"
 #include "app/gui/app/editor_layout.h"

src/app/editor/graphics/screen_editor.h

@@ -7,7 +7,6 @@
 #include "app/editor/editor.h"
 #include "app/gfx/core/bitmap.h"
 #include "app/gfx/types/snes_palette.h"
-#include "app/gui/app/editor_card_manager.h"
 #include "app/gfx/render/tilemap.h"
 #include "app/gui/canvas/canvas.h"
 #include "app/rom.h"