fix: scope native order reminders to the current futures symbol

[jackhai9]

Binance currently delivers account-wide fill and cancellation reminders in every futures tab, so one symbol can produce unrelated toasts and overlapping sounds across multiple pages. Orderbook v2.7.220 scopes ordinary order reminders to each tab's current symbol and rechecks delayed notifications after symbol changes, while preserving native switches and risk or unknown events.

The change pins the native toast and sound consumers and shares the existing early module observer. It leaves the account data stream and trading state intact; both sound modules must match before changing their shared queue contract. Source drift remains native and is reported in the diagnostic snapshot.

Validation:

• 2,225 Node tests passed, including 51 native React/notification regressions.
• 143 chart-storage browser regressions and 2 new multi-page/SPA notification browser scenarios passed using the generated artifact.
• Build, syntax, test lint, source-pin/inverse checks and independent implementation review passed.
• The unmodified native factories reproduced foreign-symbol toast and audio delivery before the fix. No live order was placed or cancelled to test this change.

Tampermonkey synchronization and exact installed-source verification follow the merge. Live trade-generated notification behavior has not yet been exercised.