Trackers: horodatage discret de la dernière maj des données (cache 1h)

backend/templates/dashboard.html

@@ -43,6 +43,9 @@
   .label .meta { font-weight: 700; font-size: 24px; letter-spacing: 1px; text-transform: uppercase;
                  margin-left: auto; padding: 4px 12px; border: 3px solid var(--ink); }
   .label .alarm { background: var(--ink); color: var(--paper); }
+  /* Horodatage discret de fraîcheur des données (ex. trackers cachés jusqu'à 1 h). */
+  .label .stamp { margin-left: auto; font-family: "JetBrains Mono", monospace;
+                  font-weight: 500; font-size: 22px; letter-spacing: 0; }
 
   hr.div { border: 0; border-top: 4px solid var(--ink); margin: 22px 0; }
   .pane hr.div { margin: 16px 0; }
@@ -209,7 +212,8 @@
 
     {% if trackers %}
     <hr class="div">
-    <div class="label"><span class="t">Trackers</span></div>
+    <div class="label"><span class="t">Trackers</span>
+      {% if trackers_updated %}<span class="stamp">maj {{ trackers_updated }}</span>{% endif %}</div>
     <div class="rows">
       {% for t in trackers %}
       <div class="trk">