chore: setup design references

docs/design/screens/integration.md

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+# Connect your website
+
+- **Route:** `/integration`
+- **API:** none (static)
+- **Visual reference:** `source/RenewCMS Screens Back-office.dc.html`, group "Integration" (open it in a browser; each state is drawn at desktop and mobile, with a light/dark toggle).
+
+Written for a developer. The base URL is window.location.origin.
+
+## States
+
+### Default
+
+**Trigger:** Opened from the sidebar or the Home card.
+
+- Breadcrumbs: Integration (mobile title "Integration")
+
+### Copied
+
+**Trigger:** The base URL was copied. The button reads "Copied" for 2 s and this is announced.
+
+- Breadcrumbs: Integration (mobile title "Integration")
+- copied: true