Kogasa

The nesting issue is an [`i3` bug.](https://github.com/i3/i3/issues/3503) I've submitted a fix for the current version of sway [here](https://github.com/swaywm/sway/pull/6979) but it won't be merged because Sway correctly reproduces i3's behavior.

Unfortunately any attempt to fix this bug must go through i3 first. I haven't seen any indication that it's a wontfix from i3, but they haven't figured out exactly what...

I've addressed both bugs in this last set of changes. CTRL+(SHIFT)+Tab will now cycle through only the _displayed_ tabs, and the channel switcher will now correctly focus offline tabs. Would...

I've noticed that I can't change the channel of a split while the setting is enabled. I'll look into fixing that.