Show the undo/redo buttons on wider widths to accommodate tablet users, and to avoid breaking workflow from old editor

[gparyani]

⚠️ Please do not suggest feature ideas for Stack Overflow. This repo is for Stacks-Editor, our standalone editing component, not Stack Overflow.

Is your feature request related to a problem? Please describe. Currently, the buttons to undo and redo are only shown on lower screen widths, to accommodate mobile users, as undoing and redoing is hard/impossible for them to do. They're hidden on higher widths, as it's assumed the user is on a desktop or laptop and can easily use the keyboard shortcut.

Here's how they look like (taken from #172):

However, this presents a problem for users using a tablet. Such users (generally) have screen widths large enough to not show the buttons, but undoing and redoing is just as difficult as on a smaller mobile device, especially if the operation is to be performed repeatedly. The same also applies to computer users using their device as a tablet (laptops that can fold completely on themselves, all-in-one desktops where the keyboard is in an inconvenient spot, etc.).

Also, the old editor always shows the undo and redo buttons even on larger widths, so it's possible users may be used to using them with their mouse. I also made use of the visual indication of them being enabled/disabled to determine whether or not I could use the keyboard shortcut (currently broken until #172 is fixed).

Describe the solution you'd like Show the undo/redo buttons always, instead of only on smaller screen widths. There's definitely enough room...

Describe alternatives you've considered Detect for the presence of a touchscreen somehow, and show the undo/redo buttons to those users. This doesn't address the final paragraph of the problem.

Additional context N/A