Suggestion: Clarify "Install .xxx Package" button is for locally downloaded packages

[Nitrousoxide]

First of all, thank you for this app. I don't use it myself, but I've suggested this for a lot of people who are pretty new to Linux and who are using immutable distros. The ability to make it easy for someone who's not familiar with Linux or Distrobox to install packages for most major distros is huge.

I have one primary suggestion and a follow up.

First, it isn't really clear at first glance that the "Install .xxx Package" button is for locally downloaded packages only. A slight rename of that to something which makes it clear that is what it's for would be nice. I would suggest "Install Downloaded .xxx Package"

My second suggestion would be to add a feature for installing apps via the container's package manager. Either as a clickthrough on the "Install Package" button (in which case you could probably ignore my renaming suggestion above since you could give the user an option then to "install locally downloaded package" and "install via package manager" or just a separate button. This would, for all practical purposes, eliminate any need to use the scary terminal at all for managing Distroboxes and make it much more approachable for low information Linux users. I realize this would add some complexity because you would need to code for how each package manager handles its UX and account for possible halts in the installation process for things like dependencies or errors, so it's not a trivial ask.

Either way, thank you again for this great app!