chore: setup design references

docs/design/screens/home.md

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+# Home
+
+- **Route:** `/home`
+- **API:** GET /v1/article/
+- **Visual reference:** `source/RenewCMS Screens Back-office.dc.html`, group "Home" (open it in a browser; each state is drawn at desktop and mobile, with a light/dark toggle).
+
+The counts come from the list, so there's no separate endpoint. The five most recently updated articles link to the editor.
+
+## States
+
+### Default
+
+**Trigger:** The articles loaded.
+
+- Breadcrumbs: Home (mobile title "Home")
+- Subtitle: "Here's where things stand on your site."
+- Stats: 6 articles, 4 online, 2 drafts
+- Recent: the 5 most recently updated articles, with status
+
+### Loading
+
+**Trigger:** The list request is in flight. Skeletons appear after 150 ms.
+
+- Breadcrumbs: Home (mobile title "Home")
+- Subtitle: "Here's where things stand on your site."
+- Stats and recent list: skeletons
+
+### Empty, first run
+
+**Trigger:** Zero articles: a single call to action, and no stats.
+
+- Breadcrumbs: Home (mobile title "Home")
+- Subtitle: "Welcome to RenewCMS."
+- First-run empty state instead of stats and recent list
+
+### Error
+
+**Trigger:** A 500 or network failure on the list request.
+
+- Breadcrumbs: Home (mobile title "Home")
+- Subtitle: "Here's where things stand on your site."
+- Error state for the list request