Add nonzero balance filter to users page, link from dashboard card

src/app/admin/users/page.tsx

@@ -8,14 +8,25 @@ import { UsersSearch } from "@/components/admin/users-search";
 const PAGE_SIZE = 20;
 
 interface Props {
-  searchParams: Promise<{ search?: string; role?: string; page?: string }>;
+  searchParams: Promise<{ search?: string; role?: string; page?: string; balance?: string }>;
 }
 
 export default async function UsersPage({ searchParams }: Props) {
-  const { search = "", role = "", page = "1" } = await searchParams;
+  const { search = "", role = "", page = "1", balance = "" } = await searchParams;
   const currentPage = Math.max(1, parseInt(page) || 1);
   const skip = (currentPage - 1) * PAGE_SIZE;
 
+  // Collect userIds with non-zero balance if filter is active
+  let balanceUserIds: string[] | null = null;
+  if (balance === "nonzero") {
+    const groups = await prisma.balanceTransaction.groupBy({
+      by: ["userId"],
+      _sum: { amount: true },
+      having: { amount: { _sum: { not: { equals: 0 } } } },
+    });
+    balanceUserIds = groups.map((g) => g.userId);
+  }
+
   const where = {
     ...(search
       ? {
@@ -26,6 +37,7 @@ export default async function UsersPage({ searchParams }: Props) {
         }
       : {}),
     ...(role ? { role } : {}),
+    ...(balanceUserIds !== null ? { id: { in: balanceUserIds } } : {}),
   };
 
   const [users, total] = await Promise.all([
@@ -66,6 +78,7 @@ export default async function UsersPage({ searchParams }: Props) {
     const params = new URLSearchParams();
     if (search) params.set("search", search);
     if (role) params.set("role", role);
+    if (balance) params.set("balance", balance);
     params.set("page", String(p));
     return `/admin/users?${params.toString()}`;
   }
@@ -88,7 +101,7 @@ export default async function UsersPage({ searchParams }: Props) {
 
       {/* Filters */}
       <Suspense>
-        <UsersSearch initialSearch={search} initialRole={role} />
+        <UsersSearch initialSearch={search} initialRole={role} initialBalance={balance} />
       </Suspense>
 
       <UsersTable users={tableUsers} />