chore: misc tweaks — nm-applet autostart, thunar, SUPER+Q close, monitor preset

- autostart nm-applet --indicator under uwsm-app
- install networkmanagerapplet system-wide
- swap Nautilus for Thunar in file-manager bindings
- close-window bound to SUPER+Q (was SUPER+W)
- switch the active monitor preset from retina/2x to 1x 1080p/1440p
- summer-night waybar: drop custom/battery + backlight from modules-right

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

features/desktop/waybar/themes/summer-night/config.jsonc

@@ -9,7 +9,7 @@
   "spacing": 15,
   "modules-left": ["custom/nomarchy", "clock", "clock#date"],
   "modules-center": ["hyprland/workspaces"],
-  "modules-right": [ "idle_inhibitor", "pulseaudio", "custom/battery", "backlight", "tray", "custom/powermenu"],
+  "modules-right": [ "idle_inhibitor", "pulseaudio", "tray", "custom/powermenu"],
 
   "hyprland/workspaces": {
       "disable-scroll": true,