feat: display current date in timeline slider

frontend/src/components/Timeline/TimelineSlider.css

@@ -24,6 +24,21 @@
   transition: background .15s, color .15s;
   white-space: nowrap;
 }
+.timeline__date {
+  padding: 6px 10px;
+  color: #64748b;
+  font-size: 12px;
+  font-weight: 600;
+  white-space: nowrap;
+  letter-spacing: 0.02em;
+}
+
+.timeline__separator {
+  width: 1px;
+  background: #334155;
+  margin: 4px 0;
+}
+
 .timeline__step:hover { background: #334155; color: #f1f5f9; }
 .timeline__step--active {
   background: #0ea5e9;

frontend/src/components/Timeline/TimelineSlider.jsx

@@ -8,10 +8,16 @@ const STEPS = [
   { value: 'h48', label: '+48h' },
 ];
 
+const formatDate = () => new Date().toLocaleDateString('fr-FR', {
+  day: '2-digit', month: 'short', year: 'numeric',
+});
+
 export default function TimelineSlider({ activeStep, onChange }) {
   return (
     <div className="timeline">
-      {STEPS.map((step, i) => (
+      <span className="timeline__date">{formatDate()}</span>
+      <div className="timeline__separator" />
+      {STEPS.map((step) => (
         <button
           key={step.value}
           className={`timeline__step ${activeStep === step.value ? 'timeline__step--active' : ''}`}