feat(fe): add Member Intelligence (/users) page wired to full reputation data

- New /users route: member roster (trust score, clean/flagged counts, message volume)
  + inspector detail (trust breakdown, clean streak, infractions, AI profile,
  recent messages) with live search
- Backend dashboard.listUsers/getUserDetail now JOIN user_reputations to expose
  trust_score, clean_message_streak, total_infractions, last_infraction_at +
  warn_count/clean_count breakdowns
- Frontend types updated to match; useUsers refactored to PaginatedUsers shape,
  added useUserSearch for the old search behavior
- Nav rail + mobile nav: add Users entry

services/frontend/src/hooks/index.ts

@@ -7,6 +7,7 @@ export {
   useTopReactions,
   useTopReactors,
   useUserDetail,
+  useUserSearch,
   useUsers,
 } from "./use-dashboard";
 export { useGuilds } from "./use-guilds";

services/frontend/src/hooks/use-dashboard.ts

@@ -6,6 +6,7 @@ import type {
   DashboardChannelDetail,
   DashboardStats,
   DashboardUserDetail,
+  PaginatedUsers,
   TopReactedMessage,
   TopReactor,
 } from "@/lib/types";
@@ -33,7 +34,15 @@ export function useActivity(days = 14, initialData?: DashboardActivity) {
   );
 }
 
-export function useUsers(search?: string) {
+export function useUsers(initialData?: PaginatedUsers) {
+  return useSWR<PaginatedUsers>(
+    ["dashboard-users"],
+    () => dashboardApi.listUsers(50),
+    { fallbackData: initialData },
+  );
+}
+
+export function useUserSearch(search?: string) {
   return useSWR(
     ["dashboard-users", search ?? ""],
     async () => {