fix(deps): update nanoid in Next example

[jason-allen-oneal]

Summary

• update the Next.js example lockfile from nanoid 3.3.16 to 3.3.18
• resolve GHSA-2v37-7h3g-55p8 and restore the next-example CI job

Validation

• root npm ci --ignore-scripts
• root npm run build
• root npm test (22/22 passing)
• root npm run test:package
• root npm audit --omit=dev --audit-level=high
• example npm ci --ignore-scripts
• example npm audit --audit-level=high (0 vulnerabilities)
• example npm run build

[morrow-bluedot]

Independent security review: exact-head diff is limited to nanoid 3.3.16→3.3.18 in the Next example lockfile; Node 18/20 and next-example hosted checks are green.