Enhanced snapping could be confusing with small values

Speaking of #4973
It can get very difficult to move a pattern precisely with for example a 1/8 quantization without can't see it clearly.
So i'll suggest to make more vertical line appear in the grid, with less contrast compared to main ones obviously, as most daws do, and as happens also in Piano Roll.

Thanks again for your work, this new feature is anyway great, LMMS needs that

P.S: I open this issue because the PR was closed before i could comment on it.

Start by reviewing issue #4973 and the existing Piano Roll grid behavior, then locate the grid rendering and snapping entry points. Done means small quantization values show additional, lower-contrast vertical grid lines so patterns can be moved precisely without obscuring the main grid.

Written by the indexing model from the issue text.