fix(orderbook): restore rebalance after continuous close

[jackhai9]

Continuous close can finish with zero positions and orders but leave the account rebalance action hidden: a qualification check skipped while the session was busy never restarts when the counters remain unchanged.

Restart the existing qualification window after the continuous session clears its task state. Preserve the full two-second stability window, fresh all-account position validation, and manual transfer confirmation. Bump the generated userscript to v2.7.215 and document the completion and visibility behavior.

Validation:

• Reproduced the missing post-completion qualification request on the old artifact.
• Six new Playwright scenarios cover long/short closing, remaining positions/orders, authoritative API positions, and hidden-page completion followed by visibility recovery.
• 64 existing account and continuous-close browser scenarios passed.
• Full npm test: 2,087 passed; test lint, build, syntax, and diff checks passed.
• Independent read-only review passed. Live v2.7.214 source and the reported hidden action were inspected; the corrected trading path awaits manual validation after installation.