fix: attempt #3.002 at fixing colours in tmux

tmux/.config/tmux/tmux.conf

@@ -29,6 +29,8 @@ set -g status-position top                # status bar at top
 set -g status-style "fg=colour6,bg=black" # {fore,back}ground colours
 set -g window-status-separator " "        # status separator - space
 set -g status-left ""                     # left status bar not used
+set -g default-terminal "screen-256color"
+set -ag terminal-overrides ",screen-256color:RGB"
 
 # right status bar - prefix/copy status - iso8601 date + time
 set -g status-right "#{prefix_highlight} #[fg=black,bg=colour6] %y-%m-%d #[bg=black] #[fg=black,bg=colour4] %H:%M "