Add user stats page and refactor user navigation; replace modal with dedicated page for user statistics, enhancing routing and UI consistency. Update localization for new status keys in both English and Russian.

src/__data__/urls.ts

@@ -31,6 +31,8 @@ export const URLs = {
   
   // Users
   users: makeUrl('/users'),
+  userStats: (userId: string) => makeUrl(`/users/${userId}`),
+  userStatsPath: makeUrl('/users/:userId'),
   
   // Submissions
   submissions: makeUrl('/submissions'),