Add per-compte dashboard: reste à verser between entrées and versements

New /dashboard/compte page, one compte associé (freelance) at a time via
a selector. Focused on entree/versement only (not achat/hébergement/
sous-traitant): reuses the same entrée<->versement reconciliation
algorithm as the /lignes badges (a versement can settle several entrées
at once, split equally), aggregated per compte to surface outstanding
"reste à verser", over-paid entrées, and versements with no linked
entrée at all -- plus solde/entrées-vs-versements/top-clients charts for
context.

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

web/modules/custom/figli_compta_ledger/src/Controller/DashboardController.php

@@ -39,4 +39,20 @@ class DashboardController extends ControllerBase {
     ];
   }
 
+  /**
+   * Third page: one compte associé (freelance) at a time -- entrées client
+   * vs versements freelance, and above all which entrées haven't been
+   * (fully) paid out yet. Complements the aggregate /dashboard above,
+   * which mixes every compte and every type together.
+   */
+  public function compteView() {
+    return [
+      '#theme' => 'figli_compta_dashboard_compte',
+      '#current_route' => 'figli_compta_ledger.dashboard_compte',
+      '#attached' => [
+        'library' => ['figli_compta_ledger/dashboard_compte'],
+      ],
+    ];
+  }
+
 }