Show related drafts in author cluster cards

Each cluster card now shows draft count badge and up to 5 linked draft
titles with clickable links to draft detail pages. Data collected from
member nodes' draft lists during cluster detection.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/webui/data.py

@@ -572,15 +572,22 @@ def get_author_network_full(db: Database) -> dict:
 
         if len(component) >= 2:
             org_mix: dict[str, int] = Counter()
+            cluster_drafts: dict[str, str] = {}  # name -> title
             for m in component:
                 org = author_info.get(m, {}).get("org", "")
                 if org:
                     org_mix[org] += 1
+                for dn in author_info.get(m, {}).get("drafts", []):
+                    if dn not in cluster_drafts:
+                        d = db.get_draft(dn)
+                        cluster_drafts[dn] = d.title[:80] if d else dn
             clusters.append({
                 "id": len(clusters),
                 "members": component,
                 "org_mix": dict(org_mix.most_common()),
                 "size": len(component),
+                "drafts": [{"name": n, "title": t} for n, t in list(cluster_drafts.items())[:15]],
+                "draft_count": len(cluster_drafts),
             })
 
     clusters.sort(key=lambda c: c["size"], reverse=True)