M7a: feature onboarding (S-1, S-2, S-3, S-18) with fakes, unit and screenshot tests

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B

android/feature/onboarding/build.gradle.kts

@@ -1,4 +1,29 @@
-// :feature:onboarding — Pairing, partner profile step, waiting for partner, device removed (S-1, S-2, S-3, S-18; M7a). Convention: android/README.md.
+// :feature:onboarding — Pairing, partner profile step, waiting for partner, device removed (S-1, S-2, S-3, S-18; M7a).
+// Convention: android/README.md. :core:model and :core:design come from the feature plugin; :core:fakes only for debug
+// and tests.
 plugins {
     id("kvitt.android.feature")
+    alias(libs.plugins.roborazzi)
+}
+
+android {
+    // BuildConfig.DEBUG decides the server-address rule of AC-2.8 (debug builds also accept http:// on the LAN).
+    buildFeatures { buildConfig = true }
+}
+
+roborazzi {
+    outputDir.set(file("src/test/screenshots"))
+}
+
+dependencies {
+    // The Android photo picker (AC-4.3) through ActivityResultContracts.PickVisualMedia.
+    implementation(libs.androidx.activity.compose)
+
+    debugImplementation(libs.androidx.compose.ui.test.manifest)
+    testImplementation(libs.kotlinx.coroutines.test)
+    testImplementation(libs.androidx.compose.ui.test.junit4)
+    testImplementation(libs.robolectric)
+    testImplementation(libs.roborazzi)
+    testImplementation(libs.roborazzi.compose)
+    testImplementation(libs.roborazzi.junit.rule)
 }