refactor : refonte du playground avec routage Nuxt et MalioSidebar (#MUI-34)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.playground/layouts/default.vue

@@ -0,0 +1,24 @@
+<template>
+  <div class="flex h-screen">
+    <MalioSidebar :sections="navSections">
+      <template #logo>
+        <NuxtLink to="/">
+          <img src="/LOGO_MALIO.png" alt="Malio">
+        </NuxtLink>
+      </template>
+      <template #logo-collapsed>
+        <NuxtLink to="/">
+          <img src="/LOGO_MALIO_COLLAPSED.png" alt="Malio">
+        </NuxtLink>
+      </template>
+    </MalioSidebar>
+
+    <main class="flex-1 overflow-y-auto p-6">
+      <slot />
+    </main>
+  </div>
+</template>
+
+<script setup lang="ts">
+import {navSections} from '../playground.nav'
+</script>