Mobile Offline Write-Queue Simulator

This is a single-device, offline-first write queue: every write you make while the device is offline gets appended to a local FIFO queue instead of failing outright. Nothing is merged across devices and no single request is retried on its own timer — the whole point is order. Each queued op remembers the server version it expects to find; on reconnect the queue drains strictly front-to-back, and each op is checked against the server's live version before it is allowed through. Use "Remote write" to simulate another client changing the server while you're offline, then reconnect and watch how abort, skip, and force handle the resulting conflict differently — including how one stale op can cascade into several under the skip policy, because order was never renegotiated.