feat: nb change sway config to nautilus

hosts/nb/modules/sway/sway.nix

@@ -17,6 +17,44 @@ let
     '';
   };
 
+  battery-alert-swaynag = pkgs.writeShellScriptBin "battery-alert-swaynag" ''
+    #!/usr/bin/env bash
+    set -euo pipefail
+
+    # Detect a battery
+    cap_file=""
+    status_file=""
+    for d in /sys/class/power_supply/BAT*; do
+      if [[ -f "$d/capacity" ]]; then
+        cap_file="$d/capacity"
+        status_file="$d/status"
+        break
+      fi
+    done
+
+    if [[ -z "$cap_file" ]]; then
+      exit 0
+    fi
+
+    capacity=$(cat "$cap_file")
+    status=$(cat "$status_file" 2>/dev/null || echo "Unknown")
+
+    if [[ "$capacity" -lt 20 && "$status" != "Charging" && "$status" != "Full" ]]; then
+      stamp="/run/user/$(id -u)/.battery_swaynag_stamp"
+      now=$(date +%s)
+      last=0
+      if [[ -f "$stamp" ]]; then
+        last=$(cat "$stamp" 2>/dev/null || echo 0)
+      fi
+      # Avoid spamming: at most once every 5 minutes
+      if (( now - last >= 300 )); then
+        echo "$now" > "$stamp"
+        swaynag -t warning -m "Battery low: ''${capacity}% - plug in the charger." -b "Dismiss" "true" &
+        disown || true
+      fi
+    fi
+  '';
+
 
   sway-conf = builtins.readFile ./sway.conf + ''
     exec swaybg -m center -c 252525 -i ~/.wallpaper.png
@@ -32,6 +70,7 @@ in {
     waybar
     wayland
     wofi
+    battery-alert-swaynag
   ];
 
   programs.sway = {