Fix Binance chart freeze during bulk cancel

[jackhai9]

Summary

• use the live Binance chart Open Orders control instead of the ineffective TradingView showOrders override
• coalesce per-drawing full chart saves into the final cumulative save, including delayed and cross-task bursts
• preserve native cancel-dialog, symbol-filter, chart-state, and reload recovery semantics

Validation

• npm test (405/405)
• npm run test:ui (57/57)
• npm run build:binance-orderbook-trade
• npm run check:binance-orderbook-trade
• git diff --check
• independent read-only review: pass