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send_datagram() returns Err(Blocked) when the QUIC congestion window is full. This is transient — the window reopens once ACKs arrive. Previously, all send paths treated this as fatal (break/return), which killed the send task and cascaded via tokio::select! to kill the entire call. Now: log warning, drop the packet, continue. Brief audio glitch (20-100ms) instead of complete call death. FEC on the receiver side recovers most dropped packets. Fixed in: - CLI run_live send task (continue + error counter) - CLI run_file_mode send paths (2 locations) - Desktop engine send task Also hardened recv tasks: transient errors (non-closed/reset) are survived instead of causing exit. Matches the fix applied to Android client (engine.rs). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>