Rename vrKeyboard to steamKeyboardPatch; clipboard-sync on by default

- steamFrame.vrKeyboard -> steamFrame.steamKeyboardPatch (module, service
  and script names follow): it patches Steam's own on-screen keyboard
- clipboardSync.enable defaults to true: without it the nested desktop's
  clipboard is isolated

modules/vr-keyboard.nix

@@ -1,57 +0,0 @@
-# Esc/Ctrl/Alt and four arrow keys on Steam's VR keyboard.
-# The keyboard is part of Steam's UI (hardcoded layouts in steamui JS), and in
-# VR it can only send text; SteamClient.Input.ControllerKeyboardSetKeyState
-# throws "Unknown method". So:
-# - vrkbd-patch.js is injected at runtime into Steam's UI through its CEF
-#   DevTools port (127.0.0.1:8080; SteamOS starts Steam with
-#   -cef-enable-debugging). Steam's files are untouched, so updates don't undo
-#   it. It rebuilds the bottom row and, while Ctrl/Alt is active (or for Esc),
-#   hands the key combo to the helper instead of typing text. It also holds
-#   the real Ctrl/Alt down while the toggle is on (Ctrl+scroll), and routes
-#   characters Steam's key emulation turns into "1" (non-ASCII, AltGr/dead
-#   keys on the de keymap: |@{[]}\~^`äöü€…) to the helper.
-# - vrkbd-helper.mjs keeps that injection alive (Steam restarts, keyboard popup
-#   recreated) and presses the combos with `xdotool key` on :0, where gamescope
-#   keeps X focus on the window selected in VR. It only accepts ctrl/alt
-#   chords and the extra keys, so the Steam UI can't use it to type text or
-#   press Enter.
-# Depends on Steam UI internals; tested with Steam client 1790377368.
-{ config, pkgs, lib, ... }: {
-  imports = [ ./session.nix ];
-
-  options.steamFrame.vrKeyboard.enable = lib.mkEnableOption ''
-    Esc/Ctrl/Alt/AltGr and arrow keys on Steam's VR keyboard (runtime patch of
-    Steam's UI through its CEF DevTools port, plus an xdotool helper service)
-  '';
-
-  config = lib.mkMerge [
-  (lib.mkIf config.steamFrame.vrKeyboard.enable {
-    systemd.user.services.vr-keyboard = {
-      Unit.Description = "Modifier keys for Steam's VR keyboard (CEF patch + xdotool)";
-      Service = {
-        ExecStart = lib.escapeShellArgs [
-          "${pkgs.nodejs}/bin/node"
-          "${./vr-keyboard/vrkbd-helper.mjs}"
-          "${./vr-keyboard/vrkbd-patch.js}"
-          "${./vr-keyboard/vrkbd-unpatch.js}"
-          "${pkgs.xdotool}/bin/xdotool"
-        ];
-        Environment = "VRKBD_DISPLAY=:0";
-        Restart = "always";
-        RestartSec = 5;
-        TimeoutStopSec = 5;   # the helper unpatches Steam's UI on SIGTERM
-      };
-      Install.WantedBy = [ "default.target" ];
-    };
-
-    # Restart on every switch so a changed patch is re-injected (it replaces
-    # the older version).
-    steamFrame.userServices.restart = [ "vr-keyboard.service" ];
-  })
-  # Disabled: stop a still-running helper, which reverts the patch, so the
-  # stock keyboard is back right away (no Steam restart or reboot).
-  (lib.mkIf (!config.steamFrame.vrKeyboard.enable) {
-    steamFrame.userServices.stop = [ "vr-keyboard.service" ];
-  })
-  ];
-}