message: chore(typography): adjust the buttons letter-spacing variables
diff: --text-link-small: 700 14px/24px var(--font-family);
  --text-link-small-letter: 0.025em;
  --button-large: 700 18px/28px var(--font-family);
  - --button-large-letter: 0.008em;
  + --button-large-letter: 0.08em;
  --button-medium: 700 16px/24px var(--font-family);
  - --button-medium-letter: 0.008em;
  + --button-medium-letter: 0.08em;
  --text-caption: 400 12px/20px var(--font-family);
  --text-caption-letter: 0.004em;
  --text-caption-focused: 400 12px/20px var(--font-family);
  