Relocalize into existing chat

Today ChatGPT allows “Move to new chat”, but not moving a message/thread into an existing specialized chat. This becomes a major UX issue for long-running technical/project workflows where users maintain dedicated chats (Odoo, infra, governance, APIs, etc.). Users frequently ask a question in the wrong chat by mistake. Proposed feature: In the message ⋯ menu: * Move to new chat * Relocalize into existing chat Then: * choose target chat * optionally move only the message or the full branch/replies * preserve context/history links Benefits: * cleaner project organization * better long-term AI context quality * less copy/paste duplication * better power-user workflows * improved memory coherence for large technical projects