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/app_info.html

@@ -28,6 +28,14 @@
     </div>
 </div>
 
+{{if .Stack.Updating}}
+<div class="alert alert-info" style="margin-top:1rem" data-update-phase="{{.Stack.UpdatePhase}}">{{.Stack.UpdatePhaseLabel}}</div>
+{{else if .Stack.HoldReason}}
+<div class="alert alert-error" style="margin-top:1rem" data-held="true">{{.Stack.HoldReason}} <a href="/backups/apps" class="btn btn-sm btn-outline">Mentések</a></div>
+{{else if .Stack.UpdateError}}
+<div class="alert alert-warning" style="margin-top:1rem" data-update-error="true">{{.Stack.UpdateError}}</div>
+{{end}}
+
 {{if .MissingStorageLabel}}
 <div class="alert alert-warning" style="margin-top:1rem">
     <strong><svg class="ico ico-sm"><use href="#i-triangle-alert"/></svg> Hiányzó tárhely: {{.MissingStorageLabel}}</strong><br>