feat: replace mail protocol with smolmail and rebuild the UI

android/build.gradle.kts

@@ -0,0 +1,33 @@
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+// NDK 28 (flutter.ndkVersion default) is not installed; override all library
+// modules to use the installed NDK 27.
+subprojects {
+    afterEvaluate {
+        if (plugins.hasPlugin("com.android.library")) {
+            configure<com.android.build.gradle.LibraryExtension> {
+                ndkVersion = "27.0.12077973"
+            }
+        }
+    }
+}
+
+val newBuildDir: Directory = rootProject.layout.buildDirectory.dir("../../build").get()
+rootProject.layout.buildDirectory.value(newBuildDir)
+
+subprojects {
+    val newSubprojectBuildDir: Directory = newBuildDir.dir(project.name)
+    project.layout.buildDirectory.value(newSubprojectBuildDir)
+}
+subprojects {
+    project.evaluationDependsOn(":app")
+}
+
+tasks.register<Delete>("clean") {
+    delete(rootProject.layout.buildDirectory)
+}