Improve layout and remove unnecessary scrollbars from the application

Refactor Layout component to manage height and remove horizontal scrollbar. Update global CSS to hide vertical scrollbars on html, body, and root elements.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: d43bd811-9372-45a7-8ac9-4a954c0538e1
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/d43bd811-9372-45a7-8ac9-4a954c0538e1/IhbIRSa

client/src/index.css

@@ -115,22 +115,20 @@
     display: none;
   }
   
-  /* Solution simple et directe pour masquer l'ascenseur horizontal */
-  ::-webkit-scrollbar:horizontal {
-    display: none !important;
-  }
-  
-  html {
-    overflow-x: hidden !important;
-    scrollbar-width: none;
-  }
-  
-  body {
-    overflow-x: hidden !important;
+  /* Solution pour masquer l'ascenseur vertical de droite */
+  html, body {
+    height: 100%;
+    overflow: hidden !important;
   }
   
   #root {
-    overflow-x: hidden !important;
+    height: 100%;
+    overflow: hidden !important;
+  }
+  
+  .layout-container {
+    height: 100vh;
+    overflow: hidden !important;
   }
   
   .bg-secondary {