docs: add wlsunset nightlight to README

Add nightlight scripts to project structure, wlsunset to startup
sequence diagram, and Night Light entry to component choice table.

README.md

@@ -30,6 +30,7 @@ desktop that can be rebuilt from scratch in minutes.
 | **Cursor** | Sweet-cursors | Visible on dark backgrounds without clashing. |
 | **Font** | UbuntuSans Nerd Font | Clean sans-serif with full Nerd Font glyph coverage for bar/terminal icons. |
 | **Wallpaper** | [waypaper](https://github.com/anufrievroman/waypaper) + [awww](https://codeberg.org/LGFae/awww) | waypaper provides GUI selection, awww handles animated transitions (60 FPS, 2s crossfade). |
+| **Night Light** | [wlsunset](https://sr.ht/~kennylevinsen/wlsunset/) | Wayland-native blue light filter via wlr-gamma-control. Toggleable from Waybar brightness group. |
 | **Firewall** | UFW | Simple deny-incoming/allow-outgoing default. Sane baseline without iptables complexity. |
 | **AUR Helper** | [paru](https://github.com/Morganamilo/paru) | Rust-based, pacman-compatible. Supports custom PKGBUILD repos for moongreet/moonlock/moonset. |
 
@@ -134,6 +135,8 @@ defaults/
     moonarch-waybar-batsaver      Waybar module: battery conservation mode indicator
     moonarch-waybar-updates       Waybar module: package update checker (repo + AUR)
     moonarch-batsaver-toggle      Toggle battery charge limit (80% ↔ 100%)
+    moonarch-nightlight           Toggle wlsunset blue light filter on/off
+    moonarch-waybar-nightlight    Waybar module: nightlight status
 
   shell/zshrc                   Zsh config: prompt, aliases, FZF, completion
   etc/greetd/                   greetd daemon + greeter Niri config
@@ -154,8 +157,8 @@ greetd ─► niri (greeter instance) ─► moongreet ─► user authenticates
                                                          │
                            ┌──────────┬────────┬────────┬──────────┐
                            ▼          ▼        ▼        ▼          ▼
-                        waybar     swaync   foot     waypaper   nm-applet
-                        (bar)    (notify) (server)  (wallpaper)  (VPN)
+                        waybar     swaync   foot     waypaper   nm-applet  wlsunset
+                        (bar)    (notify) (server)  (wallpaper)  (VPN)    (nightlight)
 
                         systemd user services (graphical-session.target):
                         kanshi, cliphist, walker, nautilus