Add chat lobby history retrieval protocol - #274
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…ed transfer, local dedup & merge
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Add chat lobby history retrieval protocol
Implement a 4-step pull protocol allowing users to fetch chat history from friends participating in the same lobby:
New serialization items (0x20–0x23) in rschatitems.
Handlers in distributedchat.cc route, validate, and process each step.
Received history is deduplicated against local DB before merging via
p3HistoryMgr::addMessage(). Nickname fallback added for null GXS IDs.
New public API: requestLobbyHistory(), requestLobbyHistoryFromPeer()
New events: CHAT_LOBBY_EVENT_HISTORY_PROBE_RESPONSE, CHAT_LOBBY_EVENT_HISTORY_DATA