feat(android): replace WebView with tested native Compose API slice

Add real native onboarding/auth/dashboard/tasks/notes/shopping, origin-bound HTTPS and encrypted AndroidKeyStore session persistence. Archive the superseded browser renderer and tests. Verify 10 JVM tests, 6 native API-35 emulator tests, lintDebug/lintRelease and debug/unsigned release APK/AAB builds; the real upstream suite passes 7 tests and exports a nonblank native fixture screenshot. Tink host-tool update removes the old generated-protobuf warning. Full module/visual parity remains explicitly incomplete.

android/app/build.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     id("com.android.application")
+    id("org.jetbrains.kotlin.plugin.compose")
 }
 
 android {
@@ -9,8 +10,8 @@ android {
         applicationId = "community.yuvomi.mobile"
         minSdk = 26
         targetSdk = 37
-        versionCode = 1
-        versionName = "0.1.0"
+        versionCode = 2
+        versionName = "0.2.0-native-preview"
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -33,6 +34,11 @@ android {
         sourceCompatibility = JavaVersion.VERSION_17
         targetCompatibility = JavaVersion.VERSION_17
     }
+    buildFeatures { compose = true }
+    sourceSets.getByName("androidTest").kotlin.directories.apply {
+        clear()
+        add("src/androidTestNative/java")
+    }
     lint {
         abortOnError = true
         warningsAsErrors = true
@@ -41,7 +47,7 @@ android {
         testBuildType = "integration"
         sourceSets.getByName(
             "androidTest",
-        ).kotlin.directories.add("src/androidTestIntegration/java")
+        ).kotlin.directories.add("src/androidTestNativeIntegration/java")
         val testResources = providers.environmentVariable("YUVOMI_TEST_RES").get()
         sourceSets.getByName("integration").res.directories.add(testResources)
         defaultConfig.testInstrumentationRunnerArguments["server"] =
@@ -89,9 +95,13 @@ configurations.configureEach {
 dependencies {
     implementation("androidx.activity:activity-ktx:1.10.1")
     implementation("androidx.core:core-ktx:1.16.0")
-    implementation("androidx.webkit:webkit:1.14.0")
+    implementation("androidx.activity:activity-compose:1.10.1")
+    implementation("androidx.compose.material3:material3:1.4.0")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.9.4")
     testImplementation("junit:junit:4.13.2")
+    testImplementation("org.json:json:20260814")
     androidTestImplementation("androidx.test:runner:1.6.2")
     androidTestImplementation("androidx.test.ext:junit:1.2.1")
     androidTestImplementation("androidx.test.espresso:espresso-core:3.6.1")
+    androidTestImplementation("androidx.compose.ui:ui-test-junit4:1.9.0")
 }