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

A removes a duplicated UI action (ExpandNewThreadForm) and toolbar, consolidating on a single SSR-based compose flow for both room and home pages—an actual simplification of user-facing behavior and codebase surface, with tests removed for the eliminated action. B merely deletes a defensive zero-ratio guard in the reducer, trading redundant safety for marginal code reduction while making item/pair registration behavior change slightly riskier if reachable from another path, offering less durable value than A's consolidation.