Switch imports to charm.land/bubbletea/v2 and charm.land/lipgloss/v2.
View now returns tea.View with AltScreen set, key handling uses
KeyPressMsg, and colour fields use image/color.
Some users cannot list namespaces on a cluster. The add wizard showed
an error and offered no way forward.
The namespace step now switches to a text prompt when the list call
fails or returns nothing. The prompt shows the reason and checks that
the name is a valid DNS label. Esc from a later step returns to the
prompt.
The j and k keys now type into text fields. They moved the list cursor
before, so a name such as kube-system could not be typed.
Closes#66
lukaszraczylo
