Add admin recent-opens drill-in popup for top apps and users

Task #41: Show a usage history popup when admins click a top
apps row or a most-active users row on the admin dashboard.

Changes:
- API: extracted the existing range/from/to parser in
  artifacts/api-server/src/routes/stats.ts into a shared
  parseRangeWindow() helper so the same window logic powers
  the existing /stats/admin endpoint and two new ones.
- API: added GET /stats/admin/app-opens/by-app/:appId returning
  the last 100 opens for an app inside the selected window,
  including the user (id, username, displayName, avatarUrl)
  and a totalCount. requireAuth + requireAdmin guarded.
- API: added GET /stats/admin/app-opens/by-user/:userId with
  the same shape but per-app metadata for each open.
- Spec: added matching paths and AdminAppOpensByApp /
  AdminAppOpensByUser schemas in lib/api-spec/openapi.yaml,
  reran orval codegen for api-client-react and api-zod.
- UI: in artifacts/teaboy-os/src/pages/admin.tsx the Top apps
  and Most active users leaderboard rows now open a drill-in
  modal instead of immediately navigating away. The modal
  shows a scrollable timeline of recent opens (timestamp +
  user/app), respects the dashboard's current range selector
  (7d/30d/90d/custom), and exposes an "Edit app" / "View user"
  footer button that preserves the previous jump-to behaviour.
  Loading, error, and empty states are handled.
- i18n: added admin.dashboard.drillIn keys in en.json and
  ar.json (titles, subtitle, empty/error, footer buttons).

Verification: pnpm run typecheck passes.

Follow-ups proposed: #47 (clickable rows inside the popup),

Replit-Task-Id: f2fbe652-a788-4f25-9fb2-9ef2c535c8da
#48 (paginate beyond 100 opens).

lib/api-client-react/src/generated/api.schemas.ts

@@ -484,6 +484,82 @@ export interface AdminStats {
   mostActiveUsers: TopUserItem[];
 }
 
+export interface AppOpenByAppEntry {
+  id: number;
+  createdAt: string;
+  userId: number;
+  username: string;
+  /** @nullable */
+  displayNameAr?: string | null;
+  /** @nullable */
+  displayNameEn?: string | null;
+  /** @nullable */
+  avatarUrl?: string | null;
+}
+
+export type AdminAppOpensByAppRange =
+  (typeof AdminAppOpensByAppRange)[keyof typeof AdminAppOpensByAppRange];
+
+export const AdminAppOpensByAppRange = {
+  "7d": "7d",
+  "30d": "30d",
+  "90d": "90d",
+  custom: "custom",
+} as const;
+
+export interface AdminAppOpensByApp {
+  appId: number;
+  slug: string;
+  nameAr: string;
+  nameEn: string;
+  iconName: string;
+  color: string;
+  range: AdminAppOpensByAppRange;
+  rangeDays: number;
+  rangeFrom: string;
+  rangeTo: string;
+  totalCount: number;
+  opens: AppOpenByAppEntry[];
+}
+
+export interface AppOpenByUserEntry {
+  id: number;
+  createdAt: string;
+  appId: number;
+  slug: string;
+  nameAr: string;
+  nameEn: string;
+  iconName: string;
+  color: string;
+}
+
+export type AdminAppOpensByUserRange =
+  (typeof AdminAppOpensByUserRange)[keyof typeof AdminAppOpensByUserRange];
+
+export const AdminAppOpensByUserRange = {
+  "7d": "7d",
+  "30d": "30d",
+  "90d": "90d",
+  custom: "custom",
+} as const;
+
+export interface AdminAppOpensByUser {
+  userId: number;
+  username: string;
+  /** @nullable */
+  displayNameAr?: string | null;
+  /** @nullable */
+  displayNameEn?: string | null;
+  /** @nullable */
+  avatarUrl?: string | null;
+  range: AdminAppOpensByUserRange;
+  rangeDays: number;
+  rangeFrom: string;
+  rangeTo: string;
+  totalCount: number;
+  opens: AppOpenByUserEntry[];
+}
+
 export type GetAdminStatsParams = {
   /**
    * Time range for trend stats. Use "custom" with from/to.
@@ -508,3 +584,35 @@ export const GetAdminStatsRange = {
   "90d": "90d",
   custom: "custom",
 } as const;
+
+export type GetAdminAppOpensByAppParams = {
+  range?: GetAdminAppOpensByAppRange;
+  from?: string;
+  to?: string;
+};
+
+export type GetAdminAppOpensByAppRange =
+  (typeof GetAdminAppOpensByAppRange)[keyof typeof GetAdminAppOpensByAppRange];
+
+export const GetAdminAppOpensByAppRange = {
+  "7d": "7d",
+  "30d": "30d",
+  "90d": "90d",
+  custom: "custom",
+} as const;
+
+export type GetAdminAppOpensByUserParams = {
+  range?: GetAdminAppOpensByUserRange;
+  from?: string;
+  to?: string;
+};
+
+export type GetAdminAppOpensByUserRange =
+  (typeof GetAdminAppOpensByUserRange)[keyof typeof GetAdminAppOpensByUserRange];
+
+export const GetAdminAppOpensByUserRange = {
+  "7d": "7d",
+  "30d": "30d",
+  "90d": "90d",
+  custom: "custom",
+} as const;