feat(web,store,latest): forced poll — Check now stamps a Series for the next Lane pass (#146)

The control writes series.force_poll_at (column landed in migration 0014)
and never commands the poller: pending is derived as force_poll_at >
latest_checked_at and self-clears because the check stamp is written before
the fetch. The due query's forced flag overrides the rest cutoff, the
Sighting-deferral and finished-only clauses, jumps the queue, and wakes a
sleeping browser Lane; it never overrides an empty series_url, the Bookmarks
join, the refusal backoff, the sidecar-down skip or the Lane gap.

ADRs: 0013-commands-through-the-database.

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

@@ -1,21 +1,35 @@
 {{/* Per-Series page: one address per Series, keyed "<site>:<series_id>" so the
      list row is one hop from it. Everything here is a Series-level fact plus
-     the anonymous Reader count; the intervention forms a later ticket adds
-     land inside the empty .detail-grid, so this page edits nothing. */}}
+     the anonymous Reader count. The Check now control lands in its own .dform
+     below the (empty) .detail-grid; the pending marker rides the meta line
+     with the other marks. */}}
 {{define "series-detail"}}
 <a class="ghost detail-back" href="/admin/series">← Series</a>
 <h1 class="detail-title">{{.Title}}</h1>
 <p class="detail-key">{{.Key}} · {{.Site}} · {{.Kind}}</p>
 {{if .Cover}}<div class="cover"><img src="{{.Cover}}" alt="" loading="lazy"></div>
 {{else}}<div class="cover"></div>{{end}}
-<div class="detail-meta">
+{{template "series-detail-meta" .}}
+<div class="detail-grid"></div>
+{{if .CanPoll}}
+<div class="dform">
+  <div class="field"><a class="ghost act" hx-post="/admin/series/{{.Key}}/poll" hx-target="#detail-meta" hx-swap="outerHTML" href="#">Check now</a></div>
+</div>
+{{end}}
+{{end}}
+
+{{/* series-detail-meta is the meta line, and the answer a Check now press on
+     the detail page swaps into its place: the same marks, re-rendered after
+     the stamp so the pending marker shows. */}}
+{{define "series-detail-meta"}}
+<div class="detail-meta" id="detail-meta">
   <span>ch {{.Chapter}}</span>
   <span>checked {{.Checked}}</span>
   <span>{{.Readers}} readers</span>
+  {{if .Pending}}<span class="mark">{{.Requested}}</span>{{end}}
   {{if .Unpollable}}<span class="mark">unpollable</span>{{end}}
   {{if .NoCover}}<span class="mark">no cover</span>{{end}}
   {{if .Orphan}}<span class="mark">orphan</span>{{end}}
   {{if .SightingRaised}}<span class="mark">sighting-raised</span>{{end}}
 </div>
-<div class="detail-grid"></div>
 {{end}}

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

@@ -23,17 +23,7 @@
 {{if .Rows}}
 <div class="tbl series">
   <div class="thead"><span>Site</span><span class="c-ch">Ch</span><span>Checked</span><span class="c-rd">Readers</span><span>Notes</span><span></span></div>
-  {{range .Rows}}
-  <div class="trow{{if .Attention}} attention{{end}}{{if .Band}} band{{end}}">
-    <span class="c-title"><a href="/admin/series/{{.Key}}">{{.Title}}</a></span>
-    <span class="c-site site-{{.Site}}">{{.Site}}</span>
-    <span class="c-ch">{{.Ch}}</span>
-    <span>{{.Age}}</span>
-    <span class="c-rd">{{.Readers}}</span>
-    <span class="c-note">{{range .Notes}}<span class="mark">{{.}}</span>{{end}}{{if .More}}<span class="mark mark-faint">+{{.More}}</span>{{end}}</span>
-    <span class="c-act"></span>
-  </div>
-  {{end}}
+  {{range .Rows}}{{template "series-row" .}}{{end}}
 </div>
 <div class="pager">
   {{if .PrevHref}}<a class="pg" href="{{.PrevHref}}">‹ prev</a>{{else}}<span class="pg disabled">‹ prev</span>{{end}}
@@ -44,3 +34,20 @@
 <div class="empty"><strong>No series</strong><p>Nothing matches <em>{{.FilterLabel}}</em>.</p></div>
 {{end}}
 {{end}}
+
+{{/* series-row is one Series list row, and the answer a Check now press swaps
+     into the row's place (hx-target="closest .trow"): it must render the
+     pending marker the press created. The control is absent on a Series with
+     no page to fetch and on an orphan, so the owner is never offered a button
+     that can never do anything. */}}
+{{define "series-row"}}
+<div class="trow{{if .Attention}} attention{{end}}{{if .Band}} band{{end}}">
+  <span class="c-title"><a href="/admin/series/{{.Key}}">{{.Title}}</a>{{if .Pending}}<span class="mark">{{.Requested}}</span>{{end}}</span>
+  <span class="c-site site-{{.Site}}">{{.Site}}</span>
+  <span class="c-ch">{{.Ch}}</span>
+  <span>{{.Age}}</span>
+  <span class="c-rd">{{.Readers}}</span>
+  <span class="c-note">{{range .Notes}}<span class="mark">{{.}}</span>{{end}}{{if .More}}<span class="mark mark-faint">+{{.More}}</span>{{end}}</span>
+  <span class="c-act">{{if .CanPoll}}<a class="ghost act" hx-post="/admin/series/{{.Key}}/poll" hx-target="closest .trow" hx-swap="outerHTML" href="#">Check now</a>{{end}}</span>
+</div>
+{{end}}