fix: build Android against the devbox SDK and current Flutter

android/build.gradle

@@ -13,6 +13,15 @@ subprojects {
     project.evaluationDependsOn(":app")
 }
 
+// Plugin build scripts ask for Flutter's default NDK, which the read-only
+// devbox-managed SDK does not carry, so every project gets the app's pin.
+gradle.afterProject { project ->
+    def android = project.extensions.findByName("android")
+    if (android != null && android.hasProperty("ndkVersion")) {
+        android.ndkVersion = "27.0.12077973"
+    }
+}
+
 tasks.register("clean", Delete) {
     delete rootProject.buildDir
 }