style(accordion): bordures noires + ajustement espacement et typo des en-têtes [#MUI-37]

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

app/components/malio/accordion/Accordion.vue

@@ -94,7 +94,7 @@ function focusSibling(value: string, offset: 1 | -1) {
 }
 
 const rootClass = computed(() =>
-  twMerge('divide-y divide-m-border border-y border-m-border', props.groupClass),
+  twMerge('divide-y divide-black border-y border-black', props.groupClass),
 )
 
 provide(accordionContextKey, {

app/components/malio/accordion/AccordionItem.vue

@@ -81,13 +81,13 @@ function onToggle() {
 
 const headerClasses = computed(() =>
   twMerge(
-    'flex w-full items-center justify-between gap-4 px-4 py-3 text-left font-medium text-m-text transition-colors',
+    'flex w-full items-center justify-between gap-4 px-7 pt-[28px] pb-[34px] text-left font-[600] text-[20px] transition-colors',
     props.disabled ? 'cursor-not-allowed text-m-muted' : 'cursor-pointer hover:bg-m-surface',
     props.headerClass,
   ),
 )
 
-const panelInnerClass = computed(() => twMerge('px-4 py-3 text-m-text', props.panelClass))
+const panelInnerClass = computed(() => twMerge('px-7 pb-[10px]', props.panelClass))
 
 onMounted(() => {
   ctx.register(