Grid & grid examples enhancements

Quite a bunch of changes this time.

The most important one: https://github.com/user-attachments/assets/e633ceab-7aca-4403-91e0-bd03ab5d032c

Code changes in 1 commit: https://github.com/neomjs/neo/commit/249d64fa308015b4983ef91f2a31342c861fed20