# Manual smoke — F9 authorship view in the preview

Confirms the rendered preview's Authorship mode colors Claude's vs your text. One
live turn hits the SDK.

## Prereqs
- `npm run build`; launch the Extension Development Host (F5) with `sandbox/` open.

## Steps
1. Open a markdown file. Open **Cowriting: Open Track-Changes Preview** (`Ctrl+Alt+R`).
2. The header shows a `[ Track changes | Authorship ]` toggle. It opens in **Track
   changes** (unchanged behavior).
3. Select a sentence → **Ask Claude to Edit Selection** → instruct → accept.
4. Click **Authorship**. Expect: Claude's accepted text is tinted (blue) and your
   own typing is tinted (green); the header shows a legend (Claude / You). Text you
   never touched (original content) is plain.
5. Type a few words yourself, mixing into a Claude sentence. Expect: the colors
   split mid-paragraph at the exact boundaries.
6. If the doc has a mermaid or code fence Claude authored, expect the whole fence
   to carry a small author badge (not per-character).
7. Flip back to **Track changes**. Expect: the diff view is exactly as before.