Show latest credit ledger in admin

Expose a paginated global ledger timeline and load it automatically so operators can see recent credit activity without first locating a user.

admin-web/src/api/client.ts

@@ -173,6 +173,9 @@ export const adminApi = {
   user: (userId: string) =>
     request<UserDetail>(`/users/${encodeURIComponent(userId)}`),
 
+  latestLedger: (cursor?: string) =>
+    request<PageResult<LedgerEntry>>(`/credits/ledger${query({ cursor })}`),
+
   ledger: (userId: string, cursor?: string) =>
     request<PageResult<LedgerEntry>>(
       `/users/${encodeURIComponent(userId)}/ledger${query({ cursor })}`,