Correction du soucis de mise à jour via l'application

web/src/app/services/updates.service.ts

@@ -4,17 +4,29 @@ import { BehaviorSubject, Observable, catchError, of, tap } from 'rxjs';
 
 /**
  * Reflet de UpdateCheckService.UpdateStatus cote backend.
+ *
+ * Etat tri-state par image : UP_TO_DATE / UPDATE_AVAILABLE / UNKNOWN.
+ * UNKNOWN signale que la comparaison est impossible (baseline absente ou
+ * remote injoignable) — l'UI doit afficher un avertissement plutot que
+ * d'annoncer "a jour" silencieusement.
  */
+export type ImageStatusKind = 'UP_TO_DATE' | 'UPDATE_AVAILABLE' | 'UNKNOWN';
+
 export interface ImageStatus {
   image: string;
   localDigest: string | null;
   remoteDigest: string | null;
+  status: ImageStatusKind;
+  /** Conserve pour back-compat ; equivalent a (status === 'UPDATE_AVAILABLE'). */
   updateAvailable: boolean;
 }
 
 export interface UpdateStatus {
   enabled: boolean;
+  /** True si au moins une image a status === 'UPDATE_AVAILABLE'. */
   updateAvailable: boolean;
+  /** True si au moins une image a status === 'UNKNOWN'. */
+  anyUnknown: boolean;
   images: ImageStatus[];
   checkedAt: string;
 }

web/src/app/settings/settings.component.html

@@ -244,16 +244,21 @@
         <lucide-icon [img]="Download" [size]="16"></lucide-icon>
         <span>Une mise a jour est disponible.</span>
       </div>
-      <div *ngIf="!updateStatus?.updateAvailable" class="hint">
+      <div *ngIf="updateStatus?.anyUnknown && !updateStatus?.updateAvailable" class="alert alert-warn">
+        <lucide-icon [img]="Download" [size]="16"></lucide-icon>
+        <span>Verification impossible pour certaines images — voir details ci-dessous.</span>
+      </div>
+      <div *ngIf="!updateStatus?.updateAvailable && !updateStatus?.anyUnknown" class="hint">
         Tout est a jour (verifie le {{ updateStatus?.checkedAt | date:'short' }}).
       </div>
 
       <ul class="update-images" *ngIf="updateStatus?.images?.length">
         <li *ngFor="let img of updateStatus?.images">
           <strong>{{ img.image }}</strong>
-          <span *ngIf="img.updateAvailable" class="badge-update">MAJ dispo</span>
-          <span *ngIf="!img.updateAvailable && img.remoteDigest" class="badge-ok">a jour</span>
-          <span *ngIf="!img.remoteDigest" class="badge-warn">indisponible</span>
+          <span *ngIf="img.status === 'UPDATE_AVAILABLE'" class="badge-update">MAJ dispo</span>
+          <span *ngIf="img.status === 'UP_TO_DATE'" class="badge-ok">a jour</span>
+          <span *ngIf="img.status === 'UNKNOWN'" class="badge-warn"
+                title="Impossible de comparer (baseline absente ou registry injoignable)">verification impossible</span>
         </li>
       </ul>
 

web/src/app/settings/settings.component.scss

@@ -303,6 +303,7 @@
 }
 .alert-error   { background: rgba(220, 80, 80, 0.15); color: #ff9b9b; }
 .alert-success { background: rgba(80, 200, 120, 0.15); color: #a2e8b6; }
+.alert-warn    { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
 
 /* --- Slider fenetre de contexte -------------------------------------- */
 .ctx-value {