diff --git a/client/src/components/DashboardLayout.tsx b/client/src/components/DashboardLayout.tsx
index cec5282..1085b6b 100644
--- a/client/src/components/DashboardLayout.tsx
+++ b/client/src/components/DashboardLayout.tsx
@@ -21,7 +21,7 @@ import {
 } from "@/components/ui/sidebar";
 import { APP_LOGO, APP_TITLE, getLoginUrl } from "@/const";
 import { useIsMobile } from "@/hooks/useMobile";
-import { LayoutDashboard, LogOut, PanelLeft, Users, GraduationCap, Calendar, CalendarDays, Bell, BarChart3, UserCog, Mail, Settings, TrendingUp, Building2, FileSpreadsheet, ClipboardList, ChevronDown, User, FileText } from "lucide-react";
+import { LayoutDashboard, LogOut, PanelLeft, Users, GraduationCap, Calendar, CalendarDays, Bell, BarChart3, UserCog, Mail, Settings, TrendingUp, Building2, FileSpreadsheet, ClipboardList, ChevronDown, User, FileText, QrCode } from "lucide-react";
 import { CSSProperties, useEffect, useRef, useState } from "react";
 import { useLocation } from "wouter";
 import { DashboardLayoutSkeleton } from './DashboardLayoutSkeleton';
@@ -362,13 +362,13 @@ function DashboardLayoutContent({
                     <SidebarMenu className="px-2 py-1">
                       {section.items.map(item => {
                         const isActive = location === item.path;
-                        const hasSubItems = 'subItems' in item && item.subItems && item.subItems.length > 0;
-                        const isSubItemActive = hasSubItems && item.subItems.some((sub: any) => location === sub.path);
+                        const hasSubItems = 'subItems' in item && item.subItems && Array.isArray(item.subItems) && item.subItems.length > 0;
+                        const isSubItemActive = hasSubItems && Array.isArray(item.subItems) && item.subItems.some((sub: any) => location === sub.path);
                         return (
                           <div key={item.path}>
                             <SidebarMenuItem>
                               <SidebarMenuButton
-                                isActive={isActive || isSubItemActive}
+                                isActive={isActive || Boolean(isSubItemActive)}
                                 onClick={() => setLocation(item.path)}
                                 tooltip={item.label}
                                 className={`h-10 transition-all font-normal`}
@@ -379,9 +379,9 @@ function DashboardLayoutContent({
                                 <span>{item.label}</span>
                               </SidebarMenuButton>
                             </SidebarMenuItem>
-                            {hasSubItems && (
+                            {(hasSubItems && Array.isArray(item.subItems) ? (
                               <div className="ml-6 mt-1 space-y-1">
-                                {item.subItems.map((subItem: any) => {
+                                {(item.subItems as any[]).map((subItem: any) => {
                                   const isSubActive = location === subItem.path;
                                   return (
                                     <SidebarMenuItem key={subItem.path}>
@@ -397,7 +397,7 @@ function DashboardLayoutContent({
                                   );
                                 })}
                               </div>
-                            )}
+                            ) : null)}
                           </div>
                         );
                       })}
diff --git a/client/src/components/DateFormationMultiSelect.tsx b/client/src/components/DateFormationMultiSelect.tsx
index e3c4465..7cda780 100644
--- a/client/src/components/DateFormationMultiSelect.tsx
+++ b/client/src/components/DateFormationMultiSelect.tsx
@@ -62,7 +62,7 @@ export function DateFormationMultiSelect({
       onSelectionChange(selectedDateIds.filter((id) => !sequenceDateIds.includes(id)));
     } else {
       // Sélectionner toutes les dates de cette séquence
-      const newSelection = [...new Set([...selectedDateIds, ...sequenceDateIds])];
+      const newSelection = Array.from(new Set([...selectedDateIds, ...sequenceDateIds]));
       onSelectionChange(newSelection);
     }
   };
diff --git a/client/src/pages/AdminRappels.tsx b/client/src/pages/AdminRappels.tsx
index 8e6cc89..25d5d3d 100644
--- a/client/src/pages/AdminRappels.tsx
+++ b/client/src/pages/AdminRappels.tsx
@@ -596,11 +596,11 @@ export default function AdminRappels() {
                     id: seq.id,
                     nom: seq.nom,
                     formationNom: seq.formation?.nom || '',
-                    dates: seq.dates?.map(d => ({
+                    dates: seq.dates?.map((d: any) => ({
                       id: d.id,
-                      date: d.dateDebut,
-                      heureDebut: d.heureDebut || '',
-                      heureFin: d.heureFin || '',
+                      date: d.dateDebut ? new Date(d.dateDebut).toISOString() : '',
+                      heureDebut: d.dateDebut ? new Date(d.dateDebut).toLocaleTimeString('fr-FR', { hour: '2-digit', minute: '2-digit' }) : '',
+                      heureFin: d.dateFin ? new Date(d.dateFin).toLocaleTimeString('fr-FR', { hour: '2-digit', minute: '2-digit' }) : '',
                     })) || [],
                   })) || []}
                   selectedDateIds={formData.dateFormationIds}
@@ -744,9 +744,9 @@ export default function AdminRappels() {
                     formationNom: seq.formation?.nom || '',
                     dates: seq.dates?.map(d => ({
                       id: d.id,
-                      date: d.dateDebut,
-                      heureDebut: d.heureDebut || '',
-                      heureFin: d.heureFin || '',
+                      date: d.dateDebut ? new Date(d.dateDebut).toISOString() : '',
+                      heureDebut: d.dateDebut ? new Date(d.dateDebut).toLocaleTimeString('fr-FR', { hour: '2-digit', minute: '2-digit' }) : '',
+                      heureFin: d.dateFin ? new Date(d.dateFin).toLocaleTimeString('fr-FR', { hour: '2-digit', minute: '2-digit' }) : '',
                     })) || [],
                   })) || []}
                   selectedDateIds={formData.dateFormationIds}
diff --git a/client/src/pages/EmargementScan.tsx b/client/src/pages/EmargementScan.tsx
index 2e3607e..ae5beb3 100644
--- a/client/src/pages/EmargementScan.tsx
+++ b/client/src/pages/EmargementScan.tsx
@@ -75,7 +75,7 @@ export default function EmargementScan() {
   };
 
   // Déterminer les dates disponibles
-  const datesDisponibles = selectedInscription?.sequence?.dates || [];
+  const datesDisponibles = (selectedInscription?.sequence as any)?.dates || [];
 
   if (success) {
     return (
diff --git a/server/routers.ts b/server/routers.ts
index 79ff99b..d1a1b32 100644
--- a/server/routers.ts
+++ b/server/routers.ts
@@ -2132,18 +2132,26 @@ export const appRouter = router({
         // Si toutes les présences sont validées, générer l'attestation automatiquement
         if (allValidated) {
           try {
-            const { genererAttestationPDF } = await import("./attestationService");
-            const { createAttestation } = await import("./attestationService");
+            const { genererAttestationPDF, enregistrerAttestation } = await import("./attestationService");
             
             // Générer le PDF
             const { s3Key, pdfUrl } = await genererAttestationPDF(input.inscriptionId);
             
-            // Enregistrer l'attestation en base
-            await createAttestation({
-              inscriptionId: input.inscriptionId,
-              s3Key,
-              pdfUrl,
-            });
+            // Récupérer les données de l'inscription
+            const db = await getDb();
+            if (db) {
+              const inscriptionData = await db.select().from(inscriptions).where(eq(inscriptions.id, input.inscriptionId)).limit(1);
+              if (inscriptionData.length > 0) {
+                // Enregistrer l'attestation en base
+                await enregistrerAttestation(
+                  input.inscriptionId,
+                  inscriptionData[0].apprenantId,
+                  inscriptionData[0].sequenceId,
+                  s3Key,
+                  pdfUrl
+                );
+              }
+            }
 
             return {
               ...result,
diff --git a/todo.md b/todo.md
index c7dcee3..f0ddacc 100644
--- a/todo.md
+++ b/todo.md
@@ -668,3 +668,14 @@
 - [x] Générer automatiquement après validation de toutes les présences
 - [x] Envoyer par email aux apprenants
 - [x] Permettre le téléchargement depuis l'espace formateur
+
+## Corrections techniques
+
+- [x] Corriger le problème d'aperçu de l'application (erreurs TypeScript)
+- [x] Corriger les références à heureDebut/heureFin dans AdminRappels.tsx
+- [x] Corriger l'accès à la propriété dates dans EmargementScan.tsx
+- [x] Corriger l'import manquant de QrCode dans DashboardLayout.tsx
+- [x] Corriger les erreurs TypeScript dans DashboardLayout.tsx (subItems)
+- [x] Ajouter downlevelIteration dans tsconfig.json
+- [x] Corriger l'utilisation de Set dans DateFormationMultiSelect.tsx
+- [x] Corriger l'appel à createAttestation (utiliser enregistrerAttestation)
diff --git a/tsconfig.json b/tsconfig.json
index a0203ee..931c7b4 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -11,6 +11,7 @@
     "jsx": "preserve",
     "esModuleInterop": true,
     "skipLibCheck": true,
+    "downlevelIteration": true,
     "allowImportingTsExtensions": true,
     "moduleResolution": "bundler",
     "baseUrl": ".",