refactor(display): extract tile layout logic to library helper class

scripts/lockfile.sh

@@ -37,8 +37,8 @@ release_lock() {
 
 kill_locked() {
     if [ ! -f "$LOCKFILE" ]; then
-        echo "No lockfile found: $LOCKFILE"
-        return 1
+        echo "No lockfile found: $LOCKFILE (nothing to kill)"
+        return 0
     fi
 
     OLD_PID=$(cat "$LOCKFILE" 2>/dev/null)