Fix UserStats typing in users page counters

src/app/users/page.tsx

@@ -1,6 +1,6 @@
 import { auth } from '@/lib/auth';
 import { redirect } from 'next/navigation';
-import { getAllUsersWithStats } from '@/services/auth';
+import { getAllUsersWithStats, type UserStats } from '@/services/auth';
 import { getGravatarUrl } from '@/lib/gravatar';
 import { PageHeader } from '@/components/ui';
 
@@ -11,7 +11,7 @@ const OWNED_WORKSHOP_COUNT_KEYS = [
   'weeklyCheckInSessions',
   'weatherSessions',
   'gifMoodSessions',
-] as const;
+] as const satisfies readonly (keyof UserStats)[];
 
 const SHARED_WORKSHOP_COUNT_KEYS = [
   'sharedSessions',
@@ -20,12 +20,9 @@ const SHARED_WORKSHOP_COUNT_KEYS = [
   'sharedWeeklyCheckInSessions',
   'sharedWeatherSessions',
   'sharedGifMoodSessions',
-] as const;
+] as const satisfies readonly (keyof UserStats)[];
 
-function sumCountKeys(
+function sumCountKeys(counts: UserStats, keys: readonly (keyof UserStats)[]): number {
-  counts: Record<string, number>,
-  keys: readonly string[]
-): number {
   return keys.reduce((acc, key) => acc + (counts[key] ?? 0), 0);
 }