message: Update CSS color names
diff: :root {
  - --rgh-green: var(--color-fg-success, #1a7f37);
  - --rgh-red: var(--color-fg-danger, #cf222e);
  + --rgh-green: var(--color-success-fg, #1a7f37);
  + --rgh-red: var(--color-danger-fg, #cf222e);
  --rgh-border-color: var(--color-border-muted, #d8dee4);
  --rgh-background: var(--color-canvas-default, #fff);
  }
  