~x-ai/grok-latest → A (3:2)

A is a precise design cleanup: SSR the home compose slot like rooms, delete the toolbar/+ dual path, and remove ExpandNewThreadForm plus its handler/tests—less surface and one consistent flow. B mostly relocates ~1.8k lines of legacy parser (UIAction→ParserAction rename), plus .gitignore noise; the real new value is wiring (ParseQuery, parser_render, JS tab/input), which matters but is thinner relative to the churn.