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/steam-short-session-tracker

@@ -0,0 +1,77 @@
+#!/bin/bash
+
+short_session_tracker_file="/tmp/steamos-short-session-tracker"
+short_session_start_file="/tmp/steamos-short-session-start"
+short_session_duration=60
+short_session_count_before_reset=3
+
+do_repair() {
+  # This should really be part of the steam launcher as `steam --repair` or similar, but we presently only have
+  # `steam --reset` which is too heavy of a hammer.
+
+  echo >&2 "steam-short-session-tracker: Re-bootstrapping steam from OS copy."
+  # at this point, might as well make sure we won't relaunch on a sideloaded build
+  rm -f -- "$HOME/devkit-game/devkit-steam"
+  mkdir -p ~/.local/share/Steam
+  # remove some caches and stateful things known to cause Steam to fail to start if corrupt
+  rm -rf --one-file-system ~/.local/share/Steam/config/widevine
+  # cleanup the steam config dir, i.e. ~/.steam. We should try to preserve registry.vdf if possible
+  steam_config_dir="$HOME/.steam"
+  steam_config_backup_dir="$HOME/dot-steam.bak.$(date +%s)"
+  registry_vdf="$steam_config_dir/registry.vdf"
+  registry_backup_vdf="$steam_config_backup_dir/.steam/registry.vdf"
+  mv "$steam_config_dir" "$steam_config_backup_dir"
+  mkdir -p "$steam_config_dir"
+  cp -f "$registry_backup_vdf" "$registry_vdf" || true
+  # restore clean copy of binaries from RO partition
+  tar xf /usr/lib/steam/bootstraplinux_ubuntu12_32.tar.xz -C ~/.local/share/Steam
+  # rearm
+  rm "$short_session_tracker_file"
+}
+
+handle_started() {
+  short_session_count=$(< "$short_session_tracker_file" wc -l)
+  touch $short_session_start_file
+
+  if [[ "$short_session_count" -ge "$short_session_count_before_reset" ]]; then
+    echo >&2 "steam-short-session-tracker: Steam failed to start $short_session_count_before_reset times within $short_session_duration seconds"
+
+    if [ -f "$HOME/.config/inhibit-short-session-tracker" ]; then
+      echo >&2 "steam-short-session-tracker: Auto-repair disabled by config. Remove ~/.config/inhibit-short-session-tracker to re-enable"
+      return
+    fi
+
+    do_repair
+  fi
+}
+
+handle_stopped() {
+  seconds_since_started=$(($(date +%s) - $(date +%s -r "$short_session_start_file")))
+
+  if [[ "seconds_since_started" -lt "$short_session_duration" ]]; then
+    echo "frog" >> "$short_session_tracker_file"
+  else
+    rm "$short_session_tracker_file"
+  fi
+}
+
+case "$1" in
+  --track-started)
+    echo "steam-short-session-tracker: Tracking Steam start (unimplemented)"
+    # handle_started
+    ;;
+  --track-stopped)
+    echo "steam-short-session-tracker: Tracking Steam stop (unimplemented)"
+    # handle_stopped
+    ;;
+  --repair-now)
+    echo "steam-short-session-tracker: Performing immediate repair (unimplemented)"
+    # do_repair
+    ;;
+  *)
+    echo "Usage: $0 --track-started | --track-stopped | --repair-now"
+    exit 1
+    ;;
+esac
+
+exit 0