fix: scope polling to widgets, fix retry, guard dates, throttle umami

- Remove global refetchInterval; scope to widget queries via setQueryDefaults
- Fix error boundary retry: correct queryKey to [["widget"]], move invalidation to onReset
- Add toValidDate() helper in @homarr/common for cache hydration safety
- Guard date formatting in media-releases and media-requests against non-Date values
- Set umami refetchInterval to 60s via shared umamiQueryOptions constant
- Simplify dns-hole mutations to invalidate() instead of manual optimistic setData

packages/common/src/date.ts

@@ -17,6 +17,11 @@ export function formatDuration(milliseconds: number) {
   return `${minutes}:${String(seconds).padStart(2, "0")}`;
 }
 
+export const toValidDate = (value: unknown): Date | null => {
+  const date = value instanceof Date ? value : new Date(value as string | number);
+  return Number.isFinite(date.getTime()) ? date : null;
+};
+
 export const isDateWithin = (date: Date, relativeDate: string): boolean => {
   if (relativeDate.length < 2) {
     throw new Error("Relative date must be at least 2 characters long");