message: Add fallback return to uintToColorDebug()
diff: @@ -125,4 +125,7 @@ vec3 uintToColorDebug(uint v) {
  } else if (v == 5u) {
  return vec3(0.0, 1.0, 1.0); // cyan
  }
  +
  + // fallback to handle "not all code-paths return" warnings
  + return vec3(0.0, 0.0, 0.0);
  }
  