You are setting up the OpenDesign output environment for this project for the first time. Complete all steps below in order, then announce completion.

Steps

Download viewer.html from GitHub.

Fetch the file from:
```
https://raw.githubusercontent.com/manalkaff/opendesign/main/skills/opendesign/viewer.html
```
Write the response body directly to ./opendesign/index.html (create ./opendesign/ first if it does not exist). If the fetch fails, tell the user:

Could not download the OpenDesign viewer. Check your internet connection and try again, or manually copy viewer.html from the opendesign plugin to ./opendesign/index.html.
Create output folders if they do not already exist:
- ./opendesign/mockups/
- ./opendesign/design-systems/
Write ./opendesign/manifest.json if it does not already exist:

setup-opendesign

Steps