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### Summary Opening a channel on iOS 27.0.1 could terminate Buzz when a reversed, lazily loaded timeline reported an unbounded scroll extent. Flutter forwarded `Infinity` to the native navigation bar, and UIKit threw `CALayerInvalidGeometry` while setting the scroll view offset. Use the finite viewport depth for that unbounded case, preserving the scrolled-under appearance. Reject non-finite offsets at the native platform boundary as a final safety check. ### Validation - Added tests: a Flutter widget regression for an unbounded reversed timeline, and an iOS native regression for a non-finite platform-channel offset. - Reproduced the original crash by tapping `#general` on an iPhone SE running iOS 27.0.1. With this change, the channel rendered and survived repeated back-and-reopen cycles. Native logging confirmed the channel now sends finite offsets where it previously sent `Infinity`. - The native regression passed on iOS 26.5 and 27.0 simulators with Xcode 27.0. Flutter widget tests and `flutter analyze` passed. - A full channel-flow simulator run was not available: the isolated simulator Profile build could not resolve `BuzzPushKit`. The iOS 27.0.1 physical run exercised the full channel flow. - The full Flutter suite had eight notification and push test failures, all reproduced on the unchanged 0.24.0 source. --------- Signed-off-by: Tom Brow <tomb@block.xyz>