Opens every section of a brand doc, deck or long post: numbered eyebrow, Cormorant title, optional lede.

```jsx
<SectionHeader eyebrow="07 — Iconography" title="Feine Linien, ein Spark als Signatur" lede="Durchgehend Outline, 1,75 px Strich." />
```

Use `tone="ink"` on dark bands (eyebrow turns lilac). Numbering is part of the voice — signposting over decoration.