New setting: "Birthday attack (opens extra ports for hard NAT)"
- Default: OFF — no extra latency on call setup
- When ON: waits up to 3s for peer's birthday ports if peer has
non-cone NAT, adds them to the dial race
Gated end-to-end: Settings → localStorage → JS invoke →
Rust connect param → birthday wait + target injection.
LAN/cone calls unaffected regardless of setting.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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