fix(sidebar) : le hamburger pilote le repli + suppression du code de tiroir mobile mort

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/components/ui/AppTopNav.vue

@@ -3,11 +3,11 @@
     <div class="flex h-full items-center justify-between">
       <MalioButtonIcon
         icon="mdi:menu"
-        aria-label="Menu"
+        aria-label="Replier ou déplier le menu"
         variant="ghost"
         icon-size="24"
         button-class="lg:hidden text-white hover:bg-primary-600"
-        @click="ui.openMobileSidebar()"
+        @click="ui.toggleSidebar()"
       />
       <div class="hidden items-center gap-2 lg:flex">
         <h1 class="text-lg font-bold tracking-tight">Lesstime</h1>