refactor: migrate Charm libraries to v2

Import paths moved to charm.land/*/v2 and the v1 paths no longer resolve.
Ports View() -> tea.View, AltScreen/MouseMode to View fields, KeyPressMsg,
and the new progress/viewport constructors. Styled output outside Bubble
Tea switched to lipgloss.Print* because v2 downsamples colour at the output
layer. vendorHash refreshed.

nix/package.nix

@@ -11,7 +11,7 @@
 
   src = lib.cleanSource ../.;
 
-  vendorHash = "sha256-aVQ/Wsf72md9v55hZ/ig9MqBvV70msmYswUw/yIdlmk=";
+  vendorHash = "sha256-hGrS/drQiBOcqwloi15vqOdiTbweo0Oya+fF9SLM3so=";
 
   subPackages = [ "cmd/cli" ];