fix(ui) : TabList — bordure continue pleine largeur (hors bloc 1200)

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

app/components/malio/tab/TabList.vue

@@ -1,6 +1,6 @@
 <template>
   <div v-bind="$attrs">
-    <div v-if="isWindowed" class="flex items-center justify-center gap-[36px]">
+    <div v-if="isWindowed" class="flex items-center justify-center gap-[36px] border-b border-m-primary">
       <button
         type="button"
         aria-label="Onglets précédents"
@@ -17,7 +17,7 @@
 
       <div
         role="tablist"
-        class="flex flex-1 max-w-[1200px] justify-center gap-[60px] border-b border-m-primary"
+        class="flex flex-1 max-w-[1200px] justify-center gap-[60px]"
       >
         <button
           v-for="tab in visibleTabs"