feat: add support for license validity defined in days alongside months

apps/backoffice/src/app/features/certificate-designer/components/DesignerToolbar.tsx

@@ -14,6 +14,8 @@ interface Props {
   onRankChange: (id: string | null) => void;
   /** Shown for context only; edited on Certificate Requirements → Behaviour. */
   validityMonths: number;
+  /** Non-null when the type is configured in days rather than months. */
+  validityDays?: number | null;
   canEdit: boolean;
   onNewVersion: () => void;
 }
@@ -27,6 +29,7 @@ export function DesignerToolbar({
   rankId,
   onRankChange,
   validityMonths,
+  validityDays,
   canEdit,
   onNewVersion,
 }: Props) {
@@ -75,11 +78,15 @@ export function DesignerToolbar({
       {typeId && (
         <Stack gap={2}>
           <Text size="xs" c="dimmed" fw={500}>
-            {t('designer.validityYears', 'Valid for (years)')}
+            {t('designer.validity', 'Valid for')}
           </Text>
           <Group gap={6} align="baseline">
             <Text size="sm" fw={600}>
-              {Number((validityMonths / 12).toFixed(2))}
+              {validityDays != null
+                ? t('designer.validityDays', '{{count}} days', { count: validityDays })
+                : t('designer.validityMonths', '{{count}} months', {
+                    count: validityMonths,
+                  })}
             </Text>
             <Text size="xs" c="dimmed">
               {t('designer.validityEditedOn', '— set on Certificate Requirements → Behaviour')}