feat: complete v0.3 reading and discovery experience

app/api/notifications/read/route.ts

@@ -0,0 +1,13 @@
+import { NextResponse } from "next/server";
+import { requireUser } from "@/lib/auth";
+import { db } from "@/lib/db";
+import { externalUrl } from "@/lib/http";
+
+export async function POST(req: Request) {
+  try {
+    const user = await requireUser(); const form = await req.formData(); const id = Number(form.get("id"));
+    if (id) db.prepare("UPDATE notifications SET read_at=CURRENT_TIMESTAMP WHERE id=? AND user_id=?").run(id, user.id);
+    else db.prepare("UPDATE notifications SET read_at=CURRENT_TIMESTAMP WHERE user_id=? AND read_at IS NULL").run(user.id);
+    return NextResponse.redirect(externalUrl(req, "/notifications"));
+  } catch { return NextResponse.redirect(externalUrl(req, "/")); }
+}