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Detects blocking synchronous operations (HTTP calls, long DB queries,
file I/O) inside GenServer callbacks (handle_call, handle_cast,
handle_info) or LiveView callbacks (mount, handle_event,
handle_params). Blocking in these contexts stalls the process
mailbox and degrades responsiveness.
Offload blocking work to Task.Supervisor.async_nolink/2 or use
start_async/3 in LiveView.
Category: Warning / Priority: high