Determine how the Beat and Bassline Editor should work

Nobody has claimed this yet.

I'm opening this issue on the main tracker instead of [here](https://github.com/HDDigitizerMusic/lmms-alt-theme/issues/1) because from what people have been saying, it seems like the current BB editor is not ideal, and it's more from a technical standpoint than just aesthetic. Hopefully, the conversation can be opened up to the LMMS team instead of just the people who were on the [`Modern Noir` fork.](https://github.com/HDDigitizerMusic/lmms-alt-theme)

What would the Beat and Bassline editor ideally look/work like? Maybe after we have that established, we can then come up with a solution based on those standards.

> We're still trying to determine what it should work like... I think ideally, the patterns would all grow and shrink together. Then perhaps a way to prevent squishing the steps smaller than their natural size. ~ @tresf

Start by reviewing the existing Beat and Bassline editor and the linked Modern Noir issue, then read the discussion on the main tracker. Define the desired editor behavior, including coordinated pattern resizing and minimum step sizing; the work is complete when the team agrees on clear standards that can guide a later implementation.

Written by the indexing model from the issue text.