feat(grfn/system): Command to edit the current text input in emacs

First pass at an xdotool-based command to edit the current text input in
emacs

Change-Id: I1e04612478292fe83083d197d481e034a9fce97f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9971
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI

users/grfn/system/home/modules/i3.nix

@@ -149,6 +149,9 @@ in
                   # Passwords
                   "${mod}+p" = "exec rofi-pass -font '${decorationFont}'";
 
+                  # Edit current buffer
+                  "${mod}+v" = "exec edit-input";
+
                   # Media
                   "XF86AudioPlay" = "exec playerctl -p spotify play-pause";
                   "XF86AudioNext" = "exec playerctl -p spotify next";