Android overhaul: one screenshot harness in :core:design's test fixtures; kvitt.android.screenshots wires Roborazzi

Eight modules each had a copy of the same configuration-context harness (ScreenSnapshots/Snapshots); M12f had to fix
the same capture bug in two of them. :core:design's test fixtures (src/testFixtures, package
se.hagstedt.kvitt.design.testing) now hold Variant, TestClock, TestEnvironment, ScreenSnapshots with its three
capture modes (Root; Screen, with the hand-advanced frame clock; ScreenWhenIdle), MainDispatcherRule and withMain.
Test fixtures rather than a :core:testing module: :core:design's own tests can use them without a dependency on
itself, no module is added to the §6.2 graph, and lint treats them as test sources. The architecture check rejects
test fixtures outside test configurations. Modules keep only their own frame (analytics household, settle size and
inline overlays, settings avatar pictures). Every golden is unchanged.

kvitt.android.screenshots applies Roborazzi with outputDir src/test/screenshots and adds the screenshot test
libraries; the feature plugin applies it and adds the test fixtures, so the seven feature build scripts lose their
copied blocks. Removed: roborazzi-junit-rule and roborazzi-compose (never imported), the explicit
lifecycle-viewmodel-compose (feature plugin, :app) and hilt-lifecycle-viewmodel-compose in :app (both still arrive
through the features; release and debug runtime classpaths are identical), and the unused catalog entries
androidx-hilt-navigation-compose and androidx-lifecycle-viewmodel-compose. @Before/@After setMain pairs in nine test
classes use MainDispatcherRule.

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

android/app/build.gradle.kts

@@ -1,13 +1,13 @@
 // :app — MainActivity, Application, Hilt wiring (every :core:model interface bound to :data, D-041 and D-085),
-// navigation and deep links, push handling and notifications, network security and release signing (SPEC §6.2, M8).
+// navigation and deep links, push handling and notifications, network security and release signing (SPEC §6.2).
 import java.util.Properties
 
 plugins {
     id("kvitt.android.application")
     id("kvitt.android.compose")
     id("kvitt.android.hilt")
+    id("kvitt.android.screenshots")
     alias(libs.plugins.google.services)
-    alias(libs.plugins.roborazzi)
 }
 
 // SPEC §10.6: release signing from android/local.properties (git-ignored); without the keys the release build is unsigned.
@@ -67,10 +67,6 @@ android {
     }
 }
 
-roborazzi {
-    outputDir.set(file("src/test/screenshots"))
-}
-
 dependencies {
     implementation(project(":core:model"))
     implementation(project(":core:design"))
@@ -85,25 +81,16 @@ dependencies {
     implementation(project(":feature:analytics"))
     implementation(project(":feature:settings"))
     testImplementation(project(":core:fakes"))
+    testImplementation(testFixtures(project(":core:design")))
 
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.activity.compose)
     implementation(libs.androidx.navigation.compose)
-    implementation(libs.androidx.hilt.lifecycle.viewmodel.compose)
     implementation(libs.androidx.lifecycle.runtime.compose)
-    implementation(libs.androidx.lifecycle.viewmodel.compose)
     implementation(libs.androidx.lifecycle.process)
     implementation(libs.androidx.work.runtime.ktx)
     implementation(libs.kotlinx.coroutines.core)
     implementation(libs.kotlinx.datetime)
     implementation(libs.coil)
     implementation(libs.coil.compose)
-
-    debugImplementation(libs.androidx.compose.ui.test.manifest)
-    testImplementation(libs.androidx.compose.ui.test.junit4)
-    testImplementation(libs.kotlinx.coroutines.test)
-    testImplementation(libs.robolectric)
-    testImplementation(libs.roborazzi)
-    testImplementation(libs.roborazzi.compose)
-    testImplementation(libs.roborazzi.junit.rule)
 }

android/app/src/test/kotlin/se/hagstedt/kvitt/AppViewModelTest.kt

@@ -1,31 +1,24 @@
 package se.hagstedt.kvitt
 
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.test.UnconfinedTestDispatcher
-import kotlinx.coroutines.test.resetMain
-import kotlinx.coroutines.test.setMain
-import org.junit.After
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
 import org.junit.Assert.assertNull
 import org.junit.Assert.assertTrue
-import org.junit.Before
+import org.junit.Rule
 import org.junit.Test
 import se.hagstedt.kvitt.fakes.FakeRepositories
 import se.hagstedt.kvitt.fakes.FakeScenario
 import se.hagstedt.kvitt.fakes.FakeScenarios
 import se.hagstedt.kvitt.link.AppLink
 import se.hagstedt.kvitt.model.SessionState
+import se.hagstedt.kvitt.design.testing.MainDispatcherRule
 
 /** The shell's link and permission rules: AC-2.6 (D-084) and AC-2.9. A plain JVM test over the fakes. */
 @OptIn(ExperimentalCoroutinesApi::class)
 class AppViewModelTest {
-    @Before
-    fun setUp() = Dispatchers.setMain(UnconfinedTestDispatcher())
-
-    @After
-    fun tearDown() = Dispatchers.resetMain()
+    @get:Rule
+    val main = MainDispatcherRule()
 
     private fun vm(fakes: FakeRepositories) = AppViewModel(fakes.session, fakes.sync, fakes.accounts)
 

android/app/src/test/kotlin/se/hagstedt/kvitt/KvittEmptyScreenScreenshotTest.kt

@@ -11,6 +11,7 @@ import org.robolectric.RobolectricTestRunner
 import org.robolectric.annotation.Config
 import org.robolectric.annotation.GraphicsMode
 import se.hagstedt.kvitt.design.KvittTheme
+import se.hagstedt.kvitt.design.testing.ScreenSnapshots
 
 /**
  * Golden screenshots of the empty screen in light and dark (Roborazzi on Robolectric). `check` verifies them;
@@ -19,7 +20,7 @@ import se.hagstedt.kvitt.design.KvittTheme
  */
 @RunWith(RobolectricTestRunner::class)
 @GraphicsMode(GraphicsMode.Mode.NATIVE)
-@Config(sdk = [36], qualifiers = "w411dp-h891dp-mdpi", application = Application::class)
+@Config(sdk = [36], qualifiers = ScreenSnapshots.QUALIFIERS, application = Application::class)
 class KvittEmptyScreenScreenshotTest {
     @get:Rule
     val compose = createComposeRule()