Latest Chapter provenance line naming the actor class (#152)

backend/internal/web/templates/series-detail.html

@@ -38,10 +38,13 @@
 
 {{/* series-detail-meta is the meta line, and the answer a Check now or
      correction press on the detail page swaps into its place: the same marks,
-     re-rendered after the stamp so the pending and corrected markers show. */}}
+     re-rendered after the stamp so the pending and corrected markers — and
+     the provenance line beside the number — describe the value they sit
+     next to. */}}
 {{define "series-detail-meta"}}
 <div class="detail-meta" id="detail-meta">
   <span>ch {{.Chapter}}</span>
+  {{if .Provenance}}<span>{{.Provenance}}</span>{{end}}
   <span>checked {{.Checked}}</span>
   <span>{{.Readers}} readers</span>
   {{if .Corrected}}<span class="mark">{{.Corrected}}</span>{{end}}
@@ -51,4 +54,4 @@
   {{if .Orphan}}<span class="mark">orphan</span>{{end}}
   {{if .SightingRaised}}<span class="mark">sighting-raised</span>{{end}}
 </div>
-{{end}}
+{{end}}