Fix Steam login flicker with 2GB shm and stable launch scripts.

Use tini-backed entrypoint, two-phase Steam startup, and a window keeper so CEF UI and the fluxbox toolbar stay visible in Moonlight.

Co-authored-by: Cursor <cursoragent@cursor.com>

players/p2_config/keep-steam-window.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+export DISPLAY=:99
+
+SCREEN_W=1920
+SCREEN_H=1080
+TOOLBAR_H=32
+
+find_window() {
+  local title="$1"
+  xwininfo -root -tree 2>/dev/null | grep "\"${title}\"" | head -1 | awk '{print $1}'
+}
+
+window_state() {
+  xwininfo -id "$1" 2>/dev/null | awk '/Map State/{print $NF}'
+}
+
+center_window() {
+  local wid="$1"
+  local geom w h x y
+  geom="$(xwininfo -id "${wid}" 2>/dev/null | awk '/-geometry/{print $2}')"
+  w="${geom%%x*}"
+  h="${geom#*x}"; h="${h%%+*}"
+  [ -n "${w}" ] && [ -n "${h}" ] || return 0
+  x=$(( (SCREEN_W - w) / 2 ))
+  y=$(( (SCREEN_H - TOOLBAR_H - h) / 2 ))
+  [ "${y}" -lt 0 ] && y=0
+  xdotool windowmove "${wid}" "${x}" "${y}" 2>/dev/null || true
+}
+
+while pgrep -u steam -f "steam -srt-logger-opened" >/dev/null 2>&1; do
+  wid=""
+  for title in "Sign in to Steam" "Steam Big Picture Mode"; do
+    wid="$(find_window "${title}")"
+    [ -n "${wid}" ] && break
+  done
+
+  if [ -n "${wid}" ]; then
+    state="$(window_state "${wid}")"
+    if [ "${state}" = "IsUnMapped" ] || [ -z "${state}" ]; then
+      xdotool windowmap "${wid}" 2>/dev/null || true
+    fi
+    xdotool windowraise "${wid}" 2>/dev/null || true
+    center_window "${wid}"
+    xdotool windowactivate "${wid}" 2>/dev/null || true
+  fi
+  sleep 0.5
+done