UI: Custom VSE Handle Cursors for Mac

Mac Platform-specific PDF cursors for VSE handle types.

Pull Request: https://projects.blender.org/blender/blender/pulls/125471

intern/ghost/intern/GHOST_WindowCocoa.mm

@@ -1044,6 +1044,12 @@ NSCursor *GHOST_WindowCocoa::getStandardCursor(GHOST_TStandardCursor shape) cons
       return getImageCursor(shape, @"paint_cursor_dot.pdf", NSMakePoint(16, 15));
     case GHOST_kStandardCursorCrosshairC:
       return getImageCursor(shape, @"crossc.pdf", NSMakePoint(16, 16));
+    case GHOST_kStandardCursorLeftHandle:
+      return getImageCursor(shape, @"handle_left.pdf", NSMakePoint(12, 14));
+    case GHOST_kStandardCursorRightHandle:
+      return getImageCursor(shape, @"handle_right.pdf", NSMakePoint(10, 14));
+    case GHOST_kStandardCursorBothHandles:
+      return getImageCursor(shape, @"handle_both.pdf", NSMakePoint(11, 14));
     default:
       return nullptr;
   }