FM - now with previews and editor support

My file manager is coming along nicely . I am getting more comfortable with bubbletea and lipgloss. This means (aside from fixing one or two smaller bugs) I can start adding useful features and start refactoring the code a bit. I am not a big fan of putting everything into one 500 line Update method, so pulling apart ever growing functions was number one on the todo list. I was going back and…