feat: add section divider, polish card headers, remove redundant labels

src/components/Bilan.css

@@ -536,6 +536,26 @@
   box-shadow: var(--shadow-flat);
 }
 
+.section-divider {
+  display: flex;
+  align-items: center;
+  gap: 16px;
+  margin: 48px 0 32px;
+  color: var(--text-muted);
+  font-size: 11px;
+  font-weight: 700;
+  text-transform: uppercase;
+  letter-spacing: 0.08em;
+}
+
+.section-divider::before,
+.section-divider::after {
+  content: '';
+  flex: 1;
+  height: 1px;
+  background: var(--border-slate-200);
+}
+
 .competences-grid {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
@@ -559,12 +579,16 @@
   display: flex;
   justify-content: space-between;
   align-items: center;
-  margin: 0;
-  font-size: 15px;
+  margin: 0 -24px 0 -24px;
+  padding: 12px 24px;
+  font-size: 12px;
   font-weight: 800;
   color: var(--text-primary);
   text-transform: uppercase;
-  letter-spacing: 0.05em;
+  letter-spacing: 0.06em;
+  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
+  background: rgba(248, 250, 252, 0.8);
+  border-bottom: 1px solid var(--border-slate-200);
 }
 
 .badge {
@@ -902,12 +926,6 @@
   text-align: left;
 }
 
-.evaluation-summary-section h3 {
-  font-size: 20px;
-  font-weight: 800;
-  color: var(--text-primary);
-  margin-bottom: 24px;
-}
 
 .summary-grid {
   display: grid;

src/components/Bilan.jsx

@@ -1097,9 +1097,11 @@ ${notesFormateur}`,
           })}
         </div>
 
-        <div className="evaluation-summary-section">
-          <h3>Synthèse & Observations</h3>
+        <div className="section-divider">
+          <span>Synthèse &amp; Export</span>
+        </div>
 
+        <div className="evaluation-summary-section">
           <div className="summary-grid">
             {/* Colonne gauche : Saisie et Actions */}
             <div className="summary-inputs-panel">