Flutter app fixes sync bug where stale local data overwrote newer cloud edits

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A developer building an offline-first Flutter task app found that edits made on one device were being reverted by stale data from another after launch. The root cause was a startup routine that blindly pushed all local tasks to Firebase, combined with a weak heuristic for determining which version was newer. To fix this, they added a dedicated modifiedAt timestamp to each task that updates on every local edit. They also introduced a per-user upload watermark so that only tasks changed since the last successful upload are considered. The result is a last-write-wins sync strategy that compares timestamps before deciding what to upload.

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