chore(i3-config): update file manager and add new keybindings and window rules

- Change default file manager from thunar to dolphin
- Add $mod+x keybinding for fws-powermenu (power menu)
- Add floating window rules for fws-hello and fws-about dialogs

configs/releng/airootfs/usr/local/share/fws/i3-config

@@ -7,7 +7,7 @@
 
 set $mod Mod4
 set $term kitty
-set $filemanager thunar
+set $filemanager dolphin
 set $menu rofi -show drun -show-icons
 set $browser firefox
 
@@ -43,6 +43,8 @@ bindsym $mod+b             exec $browser
 bindsym $mod+Shift+v       exec kitty -e fws-vr-setup
 # Panneau des raccourcis clavier (aussi via le bouton ⌌ de la barre)
 bindsym $mod+k             exec fws-keys
+# Menu d'alimentation (verrouiller/déconnexion/redémarrer/éteindre)
+bindsym $mod+x             exec fws-powermenu
 
 ##############
 ## FENETRES ##
@@ -128,6 +130,8 @@ bindsym XF86MonBrightnessDown exec --no-startup-id brightnessctl set 5%-
 ## REGLES FENETRES ##
 #####################
 for_window [class="floating-term"] floating enable, resize set 900 550
+for_window [class="(?i)fws-hello"] floating enable
+for_window [class="(?i)fws-about"] floating enable
 for_window [class="(?i)pavucontrol"] floating enable, resize set 700 500
 for_window [class="(?i)blueman-manager"] floating enable
 for_window [title="Picture-in-Picture"] floating enable