Preferred desktop for Switch to Desktop (kde/gnome/last), session tools for every login manager when GNOME is installed, GNOME theme texts in the app

ui/qml/Texts.qml

@@ -25,6 +25,9 @@ QtObject {
         theme: { label: "SteamOS theme", hint: "Vapor look for the desktop, Add to Steam",
                  body: "The Vapor look of SteamOS for the desktop, with its panel, launcher icon and wallpaper.",
                  changes: ["cachyos-vapor global theme", "Add to Steam in right-click menus", "Nested Desktop, Steam keyboard window rule"] },
+        gnometheme: { label: "SteamOS theme for GNOME", hint: "Vapor look, Ubuntu-style dock and desktop icons",
+                      body: "The Vapor look of SteamOS for GNOME: dark or light style with Vapor's blue, the Steam Deck wallpapers in Settings, the top bar in Vapor's panel color, and the extensions Ubuntu uses (Ubuntu Dock, desktop icons, tray icons, tiling).",
+                      changes: ["Colors for GTK4 apps and the shell (a stylesheet extension)", "Ubuntu Dock, Tiling Assistant, Desktop Icons NG, AppIndicator", "SteamOS wallpapers in GNOME Settings", "Window buttons with minimize and maximize", "Off: your settings and files are put back"] },
         glyphs: { label: "Steam Deck/Machine icons", hint: "Deck button icons in gaming mode",
                   body: "Steam shows Steam Deck button icons in gaming mode.", changes: ["STEAM_GAMEPADUI_ARGS -steamos3"] },
         single: { label: "Single user mode", hint: "No password, lock screen or wallet prompts",