style(sidebar) : padding bas des en-têtes de section (pb-3 → pb-2)

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

app/components/malio/sidebar/Sidebar.vue

@@ -28,7 +28,7 @@
         <div
           v-if="section.label"
           :class="[
-            'flex items-center gap-2 pt-2 pb-3',
+            'flex items-center gap-2 pt-2 pb-2',
             collapsed ? 'justify-center pt-[40px]' : '',
           ]"
         >