fix: exclude resolved problems from new-in-24h metrics (0.9.7)

Dashboard and created_within_hours list only show open/acknowledged problems
created in the last 24 hours; closed items appear under resolved only.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/views/ProblemsView.vue

@@ -113,7 +113,7 @@ const actingId = ref<number | null>(null);
 
 const timeFilterHint = computed(() => {
   if (createdWithinHours.value) {
-    return `Показаны проблемы, созданные за последние ${createdWithinHours.value} ч (любой статус).`;
+    return `Показаны активные проблемы, созданные за последние ${createdWithinHours.value} ч (без закрытых).`;
   }
   if (resolvedWithinHours.value) {
     return `Показаны проблемы, закрытые за последние ${resolvedWithinHours.value} ч.`;