ZhenYi c89f01b718 feat(room): improve robustness — optimistic send, atomic seq, jitter reconnect ... Backend: - Atomic seq assignment via Redis Lua script: INCR + GET run atomically inside a Lua script, preventing duplicate seqs under concurrent requests. DB reconciliation only triggers on cross-server handoff (rare path). - Broadcast channel capacity: 10,000 → 100,000 to prevent message drops under high-throughput rooms. Frontend: - Optimistic sendMessage: adds message to UI immediately (marked isOptimistic=true) so user sees it instantly. Replaces with server-confirmed message on success, marks as isOptimisticError on failure. Fire-and-forget to IndexedDB for persistence. - Seq-based dedup in onRoomMessage: replaces optimistic message by matching seq, preventing duplicates when WS arrives before REST confirm. - Reconnect jitter: replaced deterministic backoff with full jitter (random within backoff window), preventing thundering herd on server restart. - Visual WS status dot in room header: green=connected, amber (pulsing)=connecting, red=error/disconnected. - isPending check extended to cover both old 'temp-' prefix and new isOptimistic flag, showing 'Sending...' / 'Failed' badges.		2026-04-16 19:23:06 +08:00
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src	feat(room): improve robustness — optimistic send, atomic seq, jitter reconnect	2026-04-16 19:23:06 +08:00
Cargo.toml	init	2026-04-15 09:08:09 +08:00