Add per-message **Copy**, **Retry**, and **Delete** actions to chat — the standard ChatGPT/Claude.ai hover-icon pattern. Retry replaces the failed turn and re-submits the same query as a fresh research run; Delete removes the user message, research, and any assistant response for that turn. The History page also gains a Copy-query button on each card and the rerun button is now shown for failed/suspended researches too (previously only successful runs had it).
