- Rewrite the Extract button with explicit inline style so the coral CTA
reads clearly on cream (both enabled and disabled states now unambiguous).
- Rewrite DocTypePicker without the layoutId motion pill: simple bordered
toggles with clear active/inactive contrast, aria-pressed, and a
data-cursor='focus' hook.
- Add real sample assets: coffee_receipt.png and software_invoice.pdf.
- Harden loadSampleAsFile to reject text/html payloads (static hosts serve
index.html for 404s and it would silently poison /extract with an
unsupported_media_type).
