Fixing the next three scripts

-  `Tak0-Per-Window-Switch.sh` now records the listener PID in ``~/.cache/kb_layout_per_window.listener.pid``
    - reuses it if still running, preventing multiple background listeners
    - reports missing Hyprland sockets without exiting the main script.
-  `WaybarScripts.sh` adds a `launch_files()` helper that checks `$files` before execution;
    - if unset, it shows a notification instead of running an empty command.
-  `sddm_wallpaper.sh` validates `~/.config/rofi/wallust/colors-rofi.rasi` before use
    - extracts colors via a helper, and aborts with a notification if any required colors are missing.

 On branch development
 Your branch is up to date with 'origin/development'.

 Changes to be committed:
	modified:   CHANGELOG.md
	modified:   config/hypr/scripts/Tak0-Per-Window-Switch.sh
	modified:   config/hypr/scripts/WaybarScripts.sh
	modified:   config/hypr/scripts/sddm_wallpaper.sh

1 files changed, 16 insertions, 4 deletions

diff --git a/config/hypr/scripts/Tak0-Per-Window-Switch.sh b/config/hypr/scripts/Tak0-Per-Window-Switch.sh
index 7879fb85..7cec89a6 100755
--- a/config/hypr/scripts/Tak0-Per-Window-Switch.sh
+++ b/config/hypr/scripts/Tak0-Per-Window-Switch.sh
@@ -17,6 +17,7 @@ MAP_FILE="$HOME/.cache/kb_layout_per_window"
 CFG_FILE="$HOME/.config/hypr/configs/SystemSettings.conf"
 ICON="$HOME/.config/swaync/images/ja.png"
 SCRIPT_NAME="$(basename "$0")"
+LISTENER_PIDFILE="$HOME/.cache/kb_layout_per_window.listener.pid"
 
 # Ensure map file exists
 touch "$MAP_FILE"
@@ -99,7 +100,7 @@ subscribe() {
   local SOCKET2="$XDG_RUNTIME_DIR/hypr/$HYPRLAND_INSTANCE_SIGNATURE/.socket2.sock"
   [[ -S "$SOCKET2" ]] || {
     echo "Error: Hyprland socket not found." >&2
-    exit 1
+    return 1
   }
 
   socat -u UNIX-CONNECT:"$SOCKET2" - | while read -r line; do
@@ -108,9 +109,20 @@ subscribe() {
 }
 
 # Ensure only one listener
-if ! pgrep -f "$SCRIPT_NAME.*--listener" >/dev/null; then
-  subscribe --listener &
-fi
+start_listener_once() {
+  if [[ -f "$LISTENER_PIDFILE" ]]; then
+    local existing_pid
+    existing_pid=$(cat "$LISTENER_PIDFILE" 2>/dev/null || true)
+    if [[ -n "$existing_pid" ]] && kill -0 "$existing_pid" 2>/dev/null; then
+      return
+    fi
+  fi
+
+  subscribe &
+  echo $! >"$LISTENER_PIDFILE"
+}
+
+start_listener_once
 
 # CLI
 case "$1" in