Add Arch Wayland dotfiles: sway/waybar/kitty/nvim/zsh, idempotent installer

Auto-adapts sway workspace routing to however many monitors are
connected (laptop vs. desktop) instead of hardcoding output names.

config/waybar/scripts/rename-workspace.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+workspace=$(swaymsg -t get_workspaces -r | jq -c '.[] | select(.focused)')
+number=$(jq -r '.num' <<<"$workspace")
+current_name=$(jq -r '.name' <<<"$workspace")
+
+if (( number < 1 )); then
+  notify-send -a Waybar -u low "Workspace rename" \
+    "The focused workspace does not have a numeric identity."
+  exit 1
+fi
+
+current_label=${current_name#"$number:"}
+if [[ "$current_label" == "$current_name" ]]; then
+  current_label=
+else
+  current_label=${current_label# }
+fi
+
+label=$(printf '%s\n' "$current_label" | wofi --dmenu \
+  --prompt "Name workspace $number (blank resets)" \
+  --lines 1) || exit 0
+
+label=${label//$'\n'/ }
+if [[ -z "${label//[[:space:]]/}" ]]; then
+  new_name=$number
+else
+  new_name="$number: $label"
+fi
+
+quoted_name=$(jq -Rrn --arg name "$new_name" '$name | @json')
+swaymsg "rename workspace to $quoted_name" >/dev/null