Cleanup: Remove asset header include from BKE_context.hh

Trying to reduce the number of indirect includes.

source/blender/blenkernel/BKE_context.hh

@@ -10,9 +10,6 @@
 
 #include <variant>
 
-/* XXX temporary, until AssetHandle is designed properly and queries can return a pointer to it. */
-#include "DNA_asset_types.h"
-
 #include "BLI_string_ref.hh"
 #include "BLI_utildefines.h"
 #include "BLI_vector.hh"
@@ -22,6 +19,8 @@
 #include "RNA_types.hh"
 
 struct ARegion;
+struct AssetLibraryReference;
+struct AssetWeakReference;
 struct Base;
 struct bGPdata;
 struct bGPDframe;

source/blender/editors/asset/ED_asset_catalog.hh

@@ -25,6 +25,10 @@
 
 struct Main;
 
+namespace blender::asset_system {
+class AssetLibrary;
+}
+
 namespace blender::ed::asset {
 
 void catalogs_save_from_main_path(asset_system::AssetLibrary *library, const Main *bmain);