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//! Chart markers and transaction status messages.
/// Per-open-order chart marker. `x` is captured when we first see the order in
/// a WS snapshot and then advances leftward on each `push_price`, so the square
/// tracks the rolling chart. The map is keyed by `(symbol,
/// order_sequence_number)` so fills/cancels prune cleanly.
/// One row in the ledger modal: a user-initiated action that produced a
/// confirmed Solana signature (orders, cancels, close position, deposits,
/// withdrawals, stop-market orders).