10.0.3

Fixed

• Fix the Avalonia templates and samples failing to build for Android: raise the Android SupportedOSPlatformVersion from 21 to 23.0 (required by androidx.lifecycle.runtime) and align the templates' Avalonia package versions to 12.1.2 (Repo Assist, #1363).
• Add unit tests for StackArray3's add, get, find, and combine operations, covering the Few/Many representation transitions and error paths that previously had no test coverage (Repo Assist).
• Route exceptions thrown by the leading-edge emit call in DispatchThrottle.Dispatch to onError, matching the error handling already used by the timer callback and FlushAsync, so a throwing dispatch handler no longer crashes the caller's dispatch thread (Repo Assist).

Changed

• Remove the redundant open Fabulous self-import in IViewNode.fs, WidgetDefinitions.fs, WidgetDiff.fs, and Reconciler.fs (a no-op since each file is already declared in the Fabulous namespace) (Repo Assist).