v0.238.0: the page follows the update, and a held app offers no way to start it (update arc slice 4 Part 4)

No behaviour change on the box — the surface only.

- Frissítés follows the job: the button shows the phase label (polling GET /api/stacks/{name}
  every 3 s) and the page reloads when updating goes false.
- An updating card offers no lifecycle button; a held card (failed update OR failed restore) shows
  the hold sentence with a Mentések link and nothing that would start it; a failed update that held
  nothing shows its sentence above the buttons. app_info shows the same three notices.
- The updating/held checks run BEFORE isOperational, which counts `restarting` as operational — how
  the 2026-09-01 spike saw a green Frissítés beside a crash loop. Pinned with StateRestarting
  fixtures; red-proofed by moving the checks after it (both tests fail).
- No new CSS, no version number.

Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/web/templates/stacks.html

@@ -86,11 +86,22 @@
                 {{if canInstall .Meta}}<a href="/stacks/{{.Name}}/deploy" class="btn btn-primary" onclick="return checkBeforeDeploy(event, '{{.Name}}')">Telepítés</a>{{end}}
                 <a href="{{appPageURL .Meta.Slug}}" class="btn btn-outline">Részletek</a>
             {{else}}
-                {{if isOperational .State}}
+                {{/* Slice 4 (v0.238.0): the UPDATING and HELD checks come BEFORE isOperational. That
+                     predicate counts `restarting` as operational, which is how the 2026-09-01 spike saw
+                     a green Frissítés beside a crash loop. An app being updated offers no lifecycle
+                     button; a held app offers none that would start it, only the way back. */}}
+                {{if .Updating}}
+                    <span class="tag tag-progress" data-update-phase="{{.UpdatePhase}}"><span class="dot"></span>{{.UpdatePhaseLabel}}</span>
+                {{else if .HoldReason}}
+                    <div class="alert alert-error" data-held="true">{{.HoldReason}} <a href="/backups/apps" class="btn btn-sm btn-outline">Mentések</a></div>
+                    {{if not .Orphaned}}<button class="btn btn-danger" onclick="removeStack('{{.Name}}')">Eltávolítás</button>{{end}}
+                {{else if isOperational .State}}
+                    {{if .UpdateError}}<div class="alert alert-warning" data-update-error="true">{{.UpdateError}}</div>{{end}}
                     {{if not .Orphaned}}<button class="btn btn-success" onclick="stackAction(event, '{{.Name}}', 'update')">Frissítés</button>{{end}}
                     <button class="btn btn-warning" onclick="stackAction(event, '{{.Name}}', 'restart')">Újraindítás</button>
                     <button class="btn btn-danger" onclick="stackAction(event, '{{.Name}}', 'stop')">Leállítás</button>
                 {{else}}
+                    {{if .UpdateError}}<div class="alert alert-warning" data-update-error="true">{{.UpdateError}}</div>{{end}}
                     <button class="btn btn-success" onclick="stackAction(event, '{{.Name}}', 'start')">Indítás</button>
                     {{if not .Orphaned}}<button class="btn btn-danger" onclick="removeStack('{{.Name}}')">Eltávolítás</button>{{end}}
                 {{end}}