Remove unused `external` boolean from `navLinks` array in `navbar.tsx`. Replit-Commit-Author: Agent Replit-Commit-Session-Id: 6f3329ae-2dcc-46cc-bf2e-f58b7a5fa805 Replit-Commit-Checkpoint-Type: full_checkpoint Replit-Commit-Event-Id: afbd01cd-dc42-460e-8743-7da197043254 Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/e678fe28-87ab-4437-945b-7a15e872a292/6f3329ae-2dcc-46cc-bf2e-f58b7a5fa805/BWIZrK7 Replit-Helium-Checkpoint-Created: true