fix: build Android against the devbox-managed JDK and NDK

app/android/.gitignore

@@ -1,5 +1,6 @@
 gradle-wrapper.jar
 /.gradle
+/build
 /captures/
 /gradlew
 /gradlew.bat

app/android/app/build.gradle.kts

@@ -8,7 +8,10 @@ plugins {
 android {
     namespace = "page.mews.mews"
     compileSdk = flutter.compileSdkVersion
-    ndkVersion = flutter.ndkVersion
+    // The devbox-managed SDK ships this NDK and is read-only, so Gradle
+    // cannot install the Flutter default beside it; the version is pinned to
+    // what nix-android-sdk provides.
+    ndkVersion = "27.0.12077973"
 
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_17

app/android/build.gradle.kts

@@ -19,6 +19,25 @@ subprojects {
     project.evaluationDependsOn(":app")
 }
 
+// The devbox-managed SDK ships one NDK and is read-only, so Gradle can never
+// install another beside it. Plugin build scripts ask for Flutter's default
+// NDK, which the SDK does not carry; every project is therefore pinned to
+// the one it does. Matches the app's own pin in app/build.gradle.kts.
+gradle.afterProject {
+    // The devbox-managed SDK ships one NDK and is read-only, so Gradle can
+    // never install another beside it. Plugin build scripts ask for
+    // Flutter's default NDK, which the SDK does not carry; every project
+    // is therefore pinned to the one it does, as the app itself is.
+    val android = extensions.findByName("android") ?: return@afterProject
+    try {
+        android::class.java
+            .getMethod("setNdkVersion", String::class.java)
+            .invoke(android, "27.0.12077973")
+    } catch (_: NoSuchMethodException) {
+        // Nothing to pin.
+    }
+}
+
 tasks.register<Delete>("clean") {
     delete(rootProject.layout.buildDirectory)
 }