The primary personal mark — the real YH monogram image on its gradient tile.

```jsx
<MonogramTile size={96} />
<MonogramTile size={48} tone="ink" />
```

`gradient` is primary (avatar, cover corner). Below ~32px drop to a single-colour tone. Never redraw the glyph — it's an asset (`mono-white.png` / `mono-ink.png`).