docs(playground) : exemples readonly

Ajout de deux blocs readonly (vide + rempli) sur chaque page playground
concernée : InputText, InputEmail, InputAmount, InputAutocomplete,
InputPassword, InputTextArea, InputPhone, InputUpload, Date, TimePicker.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.playground/pages/composant/date/date.vue

@@ -50,6 +50,25 @@
         />
       </div>
     </div>
+
+    <div class="flex flex-wrap items-start gap-10">
+      <div class="w-[396px] space-y-3">
+        <h2 class="font-semibold">Readonly (readonly vide)</h2>
+        <MalioDate
+          label="Date de naissance (readonly vide)"
+          :readonly="true"
+        />
+      </div>
+
+      <div class="w-[396px] space-y-3">
+        <h2 class="font-semibold">Readonly (readonly rempli)</h2>
+        <MalioDate
+          v-model="readonlyFilledDate"
+          label="Date de naissance (readonly rempli)"
+          :readonly="true"
+        />
+      </div>
+    </div>
   </div>
 </template>
 
@@ -62,6 +81,7 @@ const now = new Date()
 const todayIso = toIso(now)
 const maxIso = toIso(new Date(now.getTime() + 30 * 86400000))
 
+const readonlyFilledDate = ref<string | null>('2026-06-15')
 const value = ref<string | null>(null)
 const erpValue = ref<string | null>(null)
 const bounded = ref<string | null>(null)