Coalesce continuous chart saves

[jackhai9]

Summary

• coalesce TradingView chart saves during short bursts of consecutive order-line removals in continuous close mode
• keep unrelated chart saves synchronous outside those remove bursts
• cache the proven Binance trade-form root during input synchronization and only rediscover after root replacement
• bump the Binance orderbook userscript to 2.7.178

Validation

• npm test (496 passed)
• npm run build:binance-orderbook-trade
• npm run check:binance-orderbook-trade
• node --check scripts/binance-orderbook-trade.user.js
• git diff --check
• independent read-only review completed