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Two issues caused the app to freeze on "Starting sidecar...": 1. wait_for_ready() used a blocking BufReader::lines() iterator with a timeout check between lines. If the sidecar produced no stdout output (crashed, missing binary, or slow model loading), the read blocked forever. Now uses a background thread with mpsc::recv_timeout() for a real 120s deadline. 2. start_sidecar was a synchronous Tauri command that blocked the main thread during the entire sidecar startup (up to 120s). Now async via tokio::spawn_blocking, keeping the UI responsive. Also logs all sidecar stdout lines to stderr with [sidecar-stdout] prefix for debugging. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>