Resolve the full entrée/versement group regardless of the sliding window

filterEntreeGroup, reconciliationByEntree and versementStatus only ever
searched `rows`, the currently loaded date-range slice -- a versement
linked to entrées from other years (confirmed live: one node had 3
linked entrées spanning 2023/2025/2025) silently only showed whatever
happened to be in the loaded window, both in the drill-down modal and in
the reste-à-verser/sur-versé math.

Added LedgerStatsController::groupeEntree() (GET /lignes/api/groupe/
{node}), a real DB query following field_entree_liee in both directions
(a node's own targets, and any node referencing it) -- something the
client can't discover from a partial window. toggleEntreeFilter() now
fetches the complete group up front and merges whatever isn't already
loaded into groupExtraRows; every affected computed reads the combined
pool via a new allKnownRows.

Also stopped versementStatus from defaulting to a false "ok" when a
linked entrée's reconciliation can't be resolved yet -- it now reports a
distinct "inconnu" (À vérifier) status instead of silently assuming
everything's settled.

web/modules/custom/figli_compta_ledger/templates/figli-compta-home.html.twig

@@ -196,7 +196,7 @@
   <div v-if="filterEntreeId" class="figli-modal-backdrop" @click.self="closeDrilldown">
     <div class="figli-modal">
       <div class="figli-modal-header">
-        <h3>Entrée + sorties liées</h3>
+        <h3>Entrée + sorties liées <span v-if="groupLoading" class="figli-note">vérification…</span></h3>
         <button type="button" class="figli-modal-close" @click="closeDrilldown">✕</button>
       </div>
       <div class="figli-modal-body">