Strategy switch console review follow-ups

[Pigbibi]

Summary

• Persist cash_only_execution_mode in normalizeAccountOptions so KV account preferences reload correctly.
• Align income layer summary with cash/option rules: no entry → 未读取; unset fields → 策略默认; use effective defaults in pending detection.
• Replace invalid dl/dt/dd nesting with a semantic div summary list (role="list" / role="listitem").
• Regroup reserve cash controls on the right column (策略 + 金额 + 比例); margin control stays on the left.
• Remove unused noChangesNote copy; align copy button fallback text with i18n.
• Add worker/UI validation for cash-only mode persistence and loadCurrentStrategies cash_only reads.

Test plan

• python3 scripts/sync_strategy_switch_page_asset.py
• node tests/strategy_switch_worker_validation.mjs
• python3 -m unittest discover -s tests -q
• Verify summary income layer shows 未读取 when current state unavailable
• Verify account cash_only_execution_mode preference survives reload

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