chore(hyprland): add startup services and brightness/blueman window rules

- Add mako notification daemon to startup services
- Add nm-applet for network tray icon
- Add polkit-gnome authentication agent for privilege escalation dialogs
- Add brightness control keybinds for XF86MonBrightnessUp/Down
- Add float window rule for blueman-manager
- Update startup comment to describe all session initialization tasks

configs/releng/airootfs/usr/local/share/fws/hyprland.conf.tmpl

@@ -61,8 +61,13 @@ misc {
     background_color = 0x1a1a2e          # bleu nuit FWS (aucun fond requis)
 }
 
-# Barre d'état au démarrage.
+# Démarrage de session : barre d'état, notifications, réseau dans le tray,
+# agent d'authentification GUI (indispensable pour les apps qui demandent
+# les droits admin : gestionnaire de disques, blueman…).
 exec-once = waybar
+exec-once = mako
+exec-once = nm-applet
+exec-once = /usr/lib/polkit-gnome/polkit-gnome-authentication-agent-1
 
 $mod = SUPER
 
@@ -149,6 +154,10 @@ bindl = , XF86AudioPlay, exec, playerctl play-pause
 bindl = , XF86AudioNext, exec, playerctl next
 bindl = , XF86AudioPrev, exec, playerctl previous
 
+# --- Luminosité de l'écran (portables : touches Fn) ------------------------------
+bindel = , XF86MonBrightnessUp, exec, brightnessctl set +5%
+bindel = , XF86MonBrightnessDown, exec, brightnessctl set 5%-
+
 # --- Souris : déplacer / redimensionner les fenêtres -----------------------------
 bindm = $mod, mouse:272, movewindow
 bindm = $mod, mouse:273, resizewindow
@@ -159,4 +168,5 @@ bindm = $mod, mouse:273, resizewindow
 windowrule = float on, match:class ^(floating-term)$
 windowrule = size 900 550, match:class ^(floating-term)$
 windowrule = float on, match:class ^([Pp]avucontrol|org.pulseaudio.pavucontrol)$
+windowrule = float on, match:class ^(.?[Bb]lueman-manager.*)$
 windowrule = float on, match:title ^(Picture-in-Picture)$