message: Add HIGHLIGHT_COLOR, to avoid mixing Color components
  Long term we're likely moving away from all caps names, but for now its
  needed for consistency.
diff: @@ -21,6 +21,7 @@ static Font* MAIN_FONT_BOLD = nullptr;
  static Color ITEM_COLOR(0, 185, 0, 255);
  +static Color HIGHLIGHT_COLOR(0, 185, 0, 75);
  static int FIRST_STOP = 0;
  @@ -30,7 +31,7 @@ static int SECOND_STOP = 0;
  static void drawItem(Renderer& r, ProductListBox::ProductListBoxItem& item, float x, float y, float w, float offset, bool highlight)
  {
  // draw highlight rect so as not to tint/hue colors of everything else
  - if (highlight) { r.drawBoxFilled(x, y - offset, w, LIST_ITEM_HEIGHT, ITEM_COLOR.red(), ITEM_COLOR.green(), ITEM_COLOR.blue(), 75); }
  + if (highlight) { r.drawBoxFilled(x, y - offset, w, LIST_ITEM_HEIGHT, HIGHLIGHT_COLOR.red(), HIGHLIGHT_COLOR.green(), HIGHLIGHT_COLOR.blue(), HIGHLIGHT_COLOR.alpha()); }
  r.drawBox(x + 2, y + 2 - offset, w - 4, LIST_ITEM_HEIGHT - 4, ITEM_COLOR.red(), ITEM_COLOR.green(), ITEM_COLOR.blue(), ITEM_COLOR.alpha());
  