chore: setup design references

docs/design/screens/new-article.md

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+# New article
+
+- **Route:** `modal from anywhere · /article/new`
+- **API:** POST /v1/article/
+- **Visual reference:** `source/RenewCMS Screens Back-office.dc.html`, group "New article" (open it in a browser; each state is drawn at desktop and mobile, with a light/dark toggle).
+
+Recommendation: a modal. It needs two fields, and keeping the page underneath means cancelling costs nothing. /article/new opens the same modal over the article list, so it can be linked to and the back button closes it. A successful create always makes a draft and goes to the editor.
+
+## States
+
+### Default
+
+**Trigger:** "New article" from Home, Articles or the empty state.
+
+- Breadcrumbs: Articles (mobile title "Articles")
+- Modal: **New article**
+  - text "It's saved as a draft. Titles can't be changed later, so check it now."
+  - field `Title`: placeholder "e.g. Choosing tiles for a small bathroom"; focused; counter "0 / 200"; help "3 to 200 characters."
+  - field `First paragraph`: placeholder "Start writing. You'll continue in the editor."; textarea; help "You can format it and add images in the editor."
+  - cancel "Cancel"
+  - confirm "Create draft"
+
+### Validation
+
+**Trigger:** On submit or blur. Nothing is sent.
+
+- Breadcrumbs: Articles (mobile title "Articles")
+- Modal: **New article**
+  - text "It's saved as a draft. Titles can't be changed later, so check it now."
+  - field `Title`: value "Ti"; counter "2 / 200" in error; **error "Use at least 3 characters."**
+  - field `First paragraph`: textarea; **error "Add a first paragraph. It can be a single sentence."**
+  - cancel "Cancel"
+  - confirm "Create draft"
+
+### Submitting
+
+**Trigger:** Request in flight. Fields are disabled and the dialog can't be dismissed.
+
+- Breadcrumbs: Articles (mobile title "Articles")
+- Modal: **New article**
+  - text "It's saved as a draft. Titles can't be changed later, so check it now."
+  - field `Title`: value "Choosing tiles for a small bathroom"; counter "35 / 200"
+  - field `First paragraph`: value "Small rooms show every grout line, so we start with the floor."; textarea
+  - cancel "Cancel"
+  - confirm "Creating…", loading, not dismissible
+
+### Title rejected (400)
+
+**Trigger:** A server 400 that got past the browser checks. The raw error isn't shown.
+
+- Breadcrumbs: Articles (mobile title "Articles")
+- Modal: **New article**
+  - text "It's saved as a draft. Titles can't be changed later, so check it now."
+  - field `Title`: value "Choosing tiles for a small bathroom"; counter "35 / 200"; **error "Check this title and try again."**
+  - field `First paragraph`: value "Small rooms show every grout line, so we start with the floor."; textarea
+  - Alert: "Something in the form isn't valid. Check the highlighted fields."
+  - cancel "Cancel"
+  - confirm "Create draft"
+
+### Error
+
+**Trigger:** 500 or network failure.
+
+- Breadcrumbs: Articles (mobile title "Articles")
+- Modal: **New article**
+  - text "It's saved as a draft. Titles can't be changed later, so check it now."
+  - field `Title`: value "Choosing tiles for a small bathroom"; counter "35 / 200"
+  - field `First paragraph`: value "Small rooms show every grout line, so we start with the floor."; textarea
+  - Alert: "Couldn't create the article. Your text is still here. Try again in a moment."
+  - cancel "Cancel"
+  - confirm "Create draft"