Fix running lane account marker preservation

[yvette-carlisle]

Summary

• preserve captured Codex account fields when stale run activity marker writes race after account selection
• add a regression test for stale marker rewrites erasing account summaries
• isolate the runActivity dashboard test from machine-global account control config

Verification

• cargo +nightly fmt --all
• cargo make fmt-check
• cargo make check-rust
• cargo make check-vstyle-rust
• cargo make test-rust