~anthropic/claude-sonnet-latest → A (6:4)

Commit A removes a redundant UI action/toolbar and duplicated form logic, unifying the compose flow with SSR consistency and deleting dead code plus its test, yielding a net simplification with clear lasting value. Commit B changes sibling grouping behavior (each unranked item its own group) with a test update, which is a reasonable but narrower, more speculative UX tweak whose correctness/value is less clearly justified in the diff.