~anthropic/claude-sonnet-latest → B (3:2)

Side B is a small, targeted concurrency fix that prevents readers from stalling behind pending writers on a hot page render path, a real correctness/performance bug with clear rationale. Side A is a larger refactor unifying DOM ids/actions across public/room forms, which improves clarity but is mostly renaming/restructuring churn with no bugfix, and carries more risk of regressions across multiple files and tests.