Refactor SteamOS session management and launcher scripts

- Removed obsolete launch_desktop.sh and launch_session.sh scripts.
- Introduced new steam-launcher script to handle Steam launching and session tracking.
- Added steam-short-session-tracker for monitoring short Steam sessions and triggering repairs.
- Created steamos and steamos-session scripts for managing the SteamOS session.
- Implemented steamos-session-select for switching between Gamescope and Plasma sessions.
- Updated SDDM configuration for autologin and session management.
- Added new systemd services and targets for managing Gamescope and Steam sessions.
- Created desktop entries and icons for ALVR and SteamOS shortcuts.
- Enhanced logging and error handling across scripts.
- Cleaned up unused systemd slice and service files.
- Updated Ansible playbook to reflect new configurations and file structures.

ansible/files/game_station/bin/system/launch-gamescope

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -euo pipefail
+LOGFILE="$HOME/.local/logs/gamescope.log"
+export PATH="$HOME/.local/bin:$PATH"
+
+log() { echo "[$(date --iso-8601=seconds)] $*" | tee -a "$LOGFILE"; }
+
+# SDDM sets this to wayland but apps using Gamescope must use x11
+export XDG_SESSION_TYPE=x11
+
+# Update the enviroment with DESKTOP_SESSION and all XDG variables
+log "Updating systemd user environment with XDG variables"
+dbus-update-activation-environment --systemd DESKTOP_SESSION `env | grep ^XDG_ | cut -d = -f 1`
+
+# This makes it so that xdg-desktop-portal doesn't find any portal implementations and doesn't start them and makes
+# them crash/exit because the dbus env has no DISPLAY. In turn this causes dbus calls to the portal which don't rely
+# on implementations to hang (such as SDL talking to the real time portal)
+# Plasma resets this variable when it starts
+systemctl --user set-environment XDG_DESKTOP_PORTAL_DIR=""
+
+# Remove these as they prevent gamescope-session from starting correctly
+systemctl --user unset-environment DISPLAY XAUTHORITY
+
+# If this shell script is killed then stop gamescope-session
+trap 'systemctl --user stop gamescope-session.target' HUP INT TERM
+
+# Start gamescope-session and wait
+log "Starting Gamescope Session"
+systemctl --user --wait start gamescope-session.target &
+wait
+log "Gamescope Session Ended - Performing Final Cleanup"
+
+# The 'wait' above blocks until gamescope-session.target stops
+# We want to wait until *everything* has finished. We know systemd will have
+# queued a stop job on graphical-session-pre aleady
+# by also queuing up a job we can block until that completes
+systemctl --user stop graphical-session-pre.target
+log "Gamescope Session Ended - Cleanup Complete"