feat(helix): show all files and sort sensibly in broot + enable modal mode to line up with helix

modules/home/helix/default.nix

···
     '';
   };
   broot-conf = pkgs.writeTextDir "brootconf/conf.toml" ''
+    modal = true
+    initial_mode = "command"
+
+    default_flags = "-gihc :sort_by_type"
+
     [[verbs]]
     invocation = "edit"
     key = "enter"