chore(hyprland): update hyprland config with dolphin, powermenu binding, and window rules

Replace thunar file manager with dolphin for consistency.
Add power menu keybinding (Super+X) for shutdown/restart operations.
Add floating window rules for fws-hello and fws-about applications.

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

@@ -81,9 +81,10 @@ $mod = SUPER
 bindd = $mod, Return, Ouvrir un terminal (kitty), exec, kitty
 bindd = $mod SHIFT, Return, Terminal flottant, exec, kitty --class floating-term
 bindd = $mod, R, Menu des applications, exec, wofi --show drun
-bindd = $mod, E, Gestionnaire de fichiers, exec, thunar
+bindd = $mod, E, Gestionnaire de fichiers, exec, dolphin
 bindd = $mod, B, Ouvrir Firefox, exec, firefox
 bindd = $mod, K, Afficher les raccourcis clavier, exec, fws-keys
+bindd = $mod, X, Menu d'alimentation (arrêt/redémarrage…), exec, fws-powermenu
 
 # --- Fenêtres ---------------------------------------------------------------
 bindd = $mod, Q, Fermer la fenêtre, killactive,
@@ -174,4 +175,6 @@ windowrule = float on, match:class ^(floating-term)$
 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:class ^([Ff]ws-hello)$
+windowrule = float on, match:class ^([Ff]ws-about)$
 windowrule = float on, match:title ^(Picture-in-Picture)$