refactor(fws-keys): make keyboard shortcuts tool universal for hyprland and i3

Rename fws-hypr-keys to fws-keys and extend it to support both Hyprland and i3 desktop environments. The tool now detects the session type and uses appropriate methods:

- Hyprland: queries hyprctl binds for real loaded bindings (wofi dmenu)
- i3: parses ~/.config/i3/config with variable resolution (rofi dmenu)

Update all references in configs and templates. Add VM detection warning in fws-vr-setup to prevent VR attempts in virtual machines where GPU/USB access is unavailable.

Add ttf-liberation font dependency for Steam UI stability on minimal installations and improve error guidance for Steam crashes.

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

@@ -41,6 +41,8 @@ bindsym $mod+e             exec $filemanager
 bindsym $mod+b             exec $browser
 # VR : installation des drivers/runtimes casque (HTC Vive, Index, Quest…)
 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
 
 ##############
 ## FENETRES ##
@@ -133,23 +135,16 @@ for_window [title="Picture-in-Picture"] floating enable
 ###########
 ## BARRE ##
 ###########
-bar {
-    status_command i3status
-    position top
-    colors {
-        background $base
-        statusline $text
-        separator  $surface0
-        # classe            bordure   fond      texte
-        focused_workspace   $blue     $blue     $base
-        inactive_workspace  $surface0 $base     $text
-        urgent_workspace    $red      $red      $base
-    }
-}
+# Polybar (config ~/.config/polybar/config.ini) : clone visuel de la waybar
+# Hyprland FWS — pilules, icônes, horloge+date au centre, bouton Raccourcis.
+# exec_always + pkill : la barre survit proprement aux reload ($mod+Shift+c).
+exec_always --no-startup-id sh -c 'pkill -x polybar; sleep 0.3; exec polybar -q fws'
 
 ###############
 ## AUTOSTART ##
 ###############
+# picom : coins arrondis (parité visuelle avec Hyprland) — config FWS légère.
+exec --no-startup-id picom --config ~/.config/picom.conf
 exec --no-startup-id dunst
 exec --no-startup-id nm-applet
 exec --no-startup-id /usr/lib/polkit-gnome/polkit-gnome-authentication-agent-1