feat : ajoute la section Dates & Heures dans la nav du playground (#MUI-33)

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

.playground/playground.nav.ts

@@ -25,6 +25,16 @@ export const navSections: SidebarSection[] = [
       {label: 'Éditeur riche', to: '/composant/input/inputRichText'},
     ],
   },
+  {
+    label: 'DATES & HEURES',
+    icon: 'mdi:calendar-clock',
+    items: [
+      {label: 'Date', to: '/composant/date/date'},
+      {label: 'Plage de dates', to: '/composant/date/dateRange'},
+      {label: 'Semaine', to: '/composant/date/dateWeek'},
+      {label: 'Heure', to: '/composant/time/time'},
+    ],
+  },
   {
     label: 'SÉLECTIONS',
     icon: 'mdi:form-dropdown',
@@ -55,7 +65,6 @@ export const navSections: SidebarSection[] = [
     label: 'DIVERS',
     icon: 'mdi:dots-horizontal',
     items: [
-      {label: 'Heure', to: '/composant/time/time'},
       {label: 'Sélecteur de site', to: '/composant/site/siteSelector'},
       {label: 'Formulaire client', to: '/composant/form/client'},
     ],