Add solde totals footer row + fix JSON:API pagination duplicate bug

- tfoot row: sum per compte (créditeur/débiteur colored) for the
  currently filtered rows, plus HT/TTC/écart totals
- Fixed a real bug: fetchAllLignes() paginated without a unique sort key
  (field_date_ligne alone, many ties), which let Drupal's JSON:API return
  the same row on two pages -- silently inflating totals (Bachir showed
  -3115,38€ instead of -3013,56€). Now sorts by
  field_date_ligne,drupal_internal__nid (home) / drupal_internal__nid
  (dashboard), plus a defensive client-side de-dup by node id either way.

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

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

@@ -22,7 +22,11 @@
   };
 
   async function fetchAllLignes() {
-    let url = API_BASE + '?include=field_repartition,field_repartition.field_compte,field_client&page[limit]=50&sort=field_date_ligne';
+    // sort includes drupal_internal__nid as a tie-breaker: field_date_ligne
+    // alone is not unique (many lines share a date), and without a unique
+    // secondary sort key, offset pagination can silently duplicate or skip
+    // rows across pages.
+    let url = API_BASE + '?include=field_repartition,field_repartition.field_compte,field_client&page[limit]=50&sort=field_date_ligne,drupal_internal__nid';
     const allData = [];
     const includedMap = new Map();
     while (url) {
@@ -33,7 +37,10 @@
       (json.included || []).forEach((item) => includedMap.set(item.type + ':' + item.id, item));
       url = json.links && json.links.next ? json.links.next.href : null;
     }
-    return { data: allData, includedMap };
+    // Defensive de-dup by node id, in case pagination ever repeats a row.
+    const seen = new Set();
+    const dedup = allData.filter((n) => (seen.has(n.id) ? false : (seen.add(n.id), true)));
+    return { data: dedup, includedMap };
   }
 
   function resolve(includedMap, ref) {
@@ -107,6 +114,20 @@
       errorCount() {
         return this.rows.filter((r) => r.hasError).length;
       },
+      footerTotals() {
+        const parCompte = {};
+        this.allComptes.forEach((c) => { parCompte[c] = 0; });
+        let montantHt = 0, montantTtc = 0, ecart = 0;
+        for (const r of this.filteredRows) {
+          montantHt += r.montant_ht || 0;
+          montantTtc += r.montant_ttc || 0;
+          ecart += r.ecart || 0;
+          for (const c of this.allComptes) {
+            if (r.parCompte[c] !== undefined) parCompte[c] += r.parCompte[c];
+          }
+        }
+        return { montant_ht: montantHt, montant_ttc: montantTtc, parCompte, ecart };
+      },
       filteredRows() {
         return this.rows.filter((r) => {
           if (this.filterCompte && r.parCompte[this.filterCompte] === undefined) return false;
@@ -151,6 +172,11 @@
       typeLabel(t) {
         return TYPE_LABELS[t] || t;
       },
+      soldeClass(v) {
+        if (v > 0.5) return 'figli-solde-crediteur';
+        if (v < -0.5) return 'figli-solde-debiteur';
+        return '';
+      },
       openAddForm() {
         Drupal.ajax({
           url: '/node/add/ligne_comptable',