Evite les doublons

frontend/src/pages/settings/ImportsSection.jsx

@@ -406,7 +406,11 @@ export default function ImportsSection() {
       });
       setResult({
         ok: true,
-        msg: `✔ Import terminé : ${r.inserted} / ${r.total} lignes insérées${r.skipped > 0 ? `, ${r.skipped} ignorées` : ''}.${r.errors?.length > 0 ? ` (${r.errors.length} avertissement(s))` : ''}`,
+        msg: `✔ Import terminé : ${r.inserted} / ${r.total} lignes insérées`
+          + (r.duplicates > 0 ? `, ${r.duplicates} doublon(s) ignoré(s)` : '')
+          + (r.skipped > 0 ? `, ${r.skipped} ignorée(s)` : '')
+          + '.'
+          + (r.errors?.length > 0 ? ` (${r.errors.length} avertissement(s))` : ''),
       });
       setPreview(null); setFile(null); setMapping({}); setDefaults({});
       api.get('/imports/history').then(setHistory).catch(() => {});
@@ -602,12 +606,12 @@ export default function ImportsSection() {
           <thead>
             <tr>
               <th>Date</th><th>Module</th><th>Fichier</th>
-              <th className="num">Total</th><th className="num">OK</th><th className="num">KO</th>
+              <th className="num">Total</th><th className="num">OK</th><th className="num">Doublons</th><th className="num">KO</th>
             </tr>
           </thead>
           <tbody>
             {history.length === 0 && (
-              <tr><td colSpan={6} className="text-muted" style={{ textAlign: 'center' }}>Aucun import</td></tr>
+              <tr><td colSpan={7} className="text-muted" style={{ textAlign: 'center' }}>Aucun import</td></tr>
             )}
             {history.map(h => (
               <tr key={h.id}>
@@ -616,6 +620,7 @@ export default function ImportsSection() {
                 <td className="text-muted" style={{ fontSize: 11 }}>{h.filename}</td>
                 <td className="num">{h.rows_total}</td>
                 <td className="num" style={{ color: 'var(--success)' }}>{h.rows_inserted}</td>
+                <td className="num" style={{ color: h.rows_duplicates > 0 ? 'var(--text-muted)' : undefined }}>{h.rows_duplicates ?? 0}</td>
                 <td className="num" style={{ color: h.rows_skipped > 0 ? 'var(--warning)' : undefined }}>{h.rows_skipped}</td>
               </tr>
             ))}