migrate pure-logic tests to vitest (phase 1)

vitest/expo-application-stub.ts

@@ -0,0 +1,9 @@
+/*
+ * Stub for expo-application. The real package transitively imports the `expo`
+ * package, whose native winter runtime does bare CJS requires that don't
+ * resolve under Vitest. #/env only reads nativeBuildVersion.
+ *
+ * Aliased in place of expo-application via resolve.alias in vitest.config.ts.
+ */
+export const nativeApplicationVersion = '1.0.0'
+export const nativeBuildVersion = '1'