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### What changed? Adds optimistic rendering for newly locally posted messages in channels and threads. - Messages appear immediately - Relay echoes and history are deduplicated by event ID - Rejected or timed-out publishes erase the optimistic rendering. The implementation covers reconnect and hydration races, channel-window and legacy WebSocket paths, thread-local overlays, and rapid concurrent sends. ### Why? This is a valuable partial mitigation for [BOT-1449](https://linear.app/squareup/issue/BOT-1449/buzz-mobile-posted-messages-dont-appear-until-leavingre-entering-the): senders no longer depend on receiving a relay echo before seeing their own post. It does not address the likely primary cause of stale channels. Mobile currently does not recover live subscriptions after a rate-limited relay `CLOSED`; that recovery is being handled separately. ### How is it tested? Full mobile suite: 676 passed, 1 skipped. Added regression coverage for optimistic insertion, authoritative deduplication, rollback, reconnect and hydration, thread replies, rapid and equal-time sends, never-echoed successful sends, and legacy WebSocket retirement. --------- Signed-off-by: npub102wg7q285p64ch2fjvstmf2ntn2sz3c4u5hmwatalc76mhsuauysftjtfj <7a9c8f0147a0755c5d499320bda5535cd5014715e52fb7757dfe3dadde1cef09@buzz.block.builderlab.xyz> Co-authored-by: npub102wg7q285p64ch2fjvstmf2ntn2sz3c4u5hmwatalc76mhsuauysftjtfj <7a9c8f0147a0755c5d499320bda5535cd5014715e52fb7757dfe3dadde1cef09@buzz.block.builderlab.xyz>