feat(fws_desktop): add i3 window manager option with VR compatibility note

Add i3 X11 window manager as a desktop environment option with explicit VR compatibility information. Update Hyprland label to clarify it uses Wayland and is not VR compatible. Adjust position indices for subsequent radio button options.

configs/baseline/airootfs/usr/share/anaconda/ui/spokes/fws_desktop.glade

@@ -110,7 +110,7 @@
                 </child>
                 <child>
                   <object class="GtkRadioButton" id="radio_hyprland">
-                    <property name="label" translatable="yes">Hyprland</property>
+                    <property name="label" translatable="yes">Hyprland — Wayland (NOT VR compatible)</property>
                     <property name="visible">True</property>
                     <property name="can-focus">True</property>
                     <property name="receives-default">False</property>
@@ -123,6 +123,21 @@
                     <property name="position">4</property>
                   </packing>
                 </child>
+                <child>
+                  <object class="GtkRadioButton" id="radio_i3">
+                    <property name="label" translatable="yes">i3 — X11 (VR compatible: SteamVR, HTC Vive, Valve Index…)</property>
+                    <property name="visible">True</property>
+                    <property name="can-focus">True</property>
+                    <property name="receives-default">False</property>
+                    <property name="draw-indicator">True</property>
+                    <property name="group">radio_cli</property>
+                  </object>
+                  <packing>
+                    <property name="expand">False</property>
+                    <property name="fill">True</property>
+                    <property name="position">5</property>
+                  </packing>
+                </child>
                 <child>
                   <object class="GtkRadioButton" id="radio_xfce">
                     <property name="label" translatable="yes">XFCE</property>
@@ -135,7 +150,7 @@
                   <packing>
                     <property name="expand">False</property>
                     <property name="fill">True</property>
-                    <property name="position">5</property>
+                    <property name="position">6</property>
                   </packing>
                 </child>
               </object>