fix(playground) : displayTag passé en booléen sur SelectCheckbox

`displayTag="true"` (string) déclenchait un warning de type Vue
(Expected Boolean, got String). Passage en `:display-tag="true"`.

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

.playground/pages/composant/select/selectCheckbox.vue

@@ -13,7 +13,7 @@
       <MalioSelectCheckbox
         v-model="labelValue"
         :options="options"
-        displayTag="true"
+        :display-tag="true"
         empty-option-label=" "
       />
       </div>
@@ -22,7 +22,7 @@
       <MalioSelectCheckbox
         v-model="labelValue1"
         :options="options"
-        displayTag="true"
+        :display-tag="true"
         label="Pays"
         empty-option-label=" "
       />