Add test push notification flow

app/api/notifications/test/route.ts

@@ -0,0 +1,30 @@
+import { NextResponse } from "next/server";
+import { getPushSubscription, removePushSubscription } from "@/lib/push-store";
+import { isWebPushConfigured, sendTestNotification } from "@/lib/push-service";
+
+export const runtime = "nodejs";
+
+export async function POST(request: Request) {
+  if (!isWebPushConfigured()) {
+    return NextResponse.json({ error: "Web Push is not configured." }, { status: 503 });
+  }
+
+  const body = await request.json().catch(() => null) as { endpoint?: unknown } | null;
+  if (typeof body?.endpoint !== "string" || !body.endpoint) {
+    return NextResponse.json({ error: "Invalid push subscription endpoint." }, { status: 400 });
+  }
+
+  const subscription = getPushSubscription(body.endpoint);
+  if (!subscription || !subscription.enabled) {
+    return NextResponse.json({ error: "Push subscription was not found." }, { status: 404 });
+  }
+
+  try {
+    await sendTestNotification(subscription);
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    const statusCode = typeof error === "object" && error !== null && "statusCode" in error ? Number(error.statusCode) : null;
+    if (statusCode === 404 || statusCode === 410) removePushSubscription(subscription.endpoint);
+    return NextResponse.json({ error: "Unable to send test notification." }, { status: 502 });
+  }
+}