Display /lignes dates as aa/mm/jj instead of jj/mm/aa

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/modules/custom/figli_compta_ledger/js/home.js

@@ -761,12 +761,14 @@
           'is-reste': kind === 'reste' || kind === 'inconnu',
         };
       },
-      // jj/mm/aa -- shorter than the API's ISO yyyy-mm-dd, saves column
-      // width in a table already packed with 8 compte columns.
+      // aa/mm/jj -- shorter than the API's ISO yyyy-mm-dd (saves column
+      // width in a table already packed with 8 compte columns) while
+      // keeping the same year-month-day ordering, so it still sorts
+      // correctly as plain text and reads unambiguously either way.
       formatDate(iso) {
         if (!iso) return '';
         const [y, m, d] = iso.split('-');
-        return d + '/' + m + '/' + y.slice(2);
+        return y.slice(2) + '/' + m + '/' + d;
       },
       typeLabel(t) {
         return TYPE_LABELS[t] || t;