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## What changed - Fork the conversation immediately before the selected prompt instead of rolling back the current thread in place, preserving the original conversation. - Reopen the selected prompt in the new conversation with its images, text elements, and mention bindings intact. - Start a fresh conversation when editing the first prompt, show a dedicated continuation notice, and restore the prompt with an error if branching fails. ## Testing - Cover branching before first and later prompts, source preservation, prompt restoration, hidden review prompts, mid-turn steering, in-progress turns, stale transcript entries, and mention bindings. GitOrigin-RevId: 15473535b3f9733b0300711a498969e6d389db79