fix(zsh): Tab completion and colby buffer expansion

Fix fzf_default_completion stale pointer after zle -D by setting it to
expand-or-complete before deleting the lazy comp widget. Rebind ^I
explicitly after widget deletion and add safety net in widgets.zsh
after bindkey -e.

Replace colby() function with ^M buffer expansion so the full
copilot --allow-all-tools --allow-all-paths invocation is visible
in terminal history and screen recordings.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

home/.aliases

@@ -51,7 +51,6 @@ _copilot_tmux_wrap() {
     trap - EXIT INT TERM
     [[ -n "$TMUX" ]] && (tmux set automatic-rename on &)
 }
-colby() { _copilot_tmux_wrap gh copilot --allow-all-tools --allow-all-paths "$@"; }
 alias gs='git s'
 alias gd='git d'
 alias gdc='git dc'