refactor(gfx): update include paths for graphics headers

- Changed include paths for SNES color and palette headers to reflect new organization under the 'types' and 'util' directories.
- Ensured consistency in include paths across the graphics subsystem.

Benefits:
- Improves code organization and maintainability by adhering to the updated project structure.

src/cli/handlers/graphics/gfx.cc

@@ -1,6 +1,6 @@
 #include "cli/cli.h"
-#include "app/gfx/scad_format.h"
-#include "app/gfx/arena.h"
+#include "app/gfx/util/scad_format.h"
+#include "app/gfx/resource/arena.h"
 #include "absl/flags/flag.h"
 #include "absl/flags/declare.h"
 

src/cli/handlers/graphics/palette.cc

@@ -1,8 +1,8 @@
 #include "cli/cli.h"
 #include "cli/tui/palette_editor.h"
 
-#include "app/gfx/scad_format.h"
-#include "app/gfx/snes_palette.h"
+#include "app/gfx/util/scad_format.h"
+#include "app/gfx/types/snes_palette.h"
 #include "absl/flags/flag.h"
 #include "absl/flags/declare.h"