android: compose BOM 2026.06.01 + material3 1.5.0-alpha18 (expressive API)

Drop unused navigation-compose and material3-window-size-class.
alpha19+/beta01 need AGP 9.1 + compileSdk 37, so alpha18 is pinned.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/frontends/android/app/build.gradle

@@ -155,18 +155,20 @@ dependencies {
     implementation 'androidx.work:work-runtime-ktx:2.10.1'
     implementation 'com.google.android.material:material:1.13.0'
 
-    /* BOM 2025.12.01 (compose 1.10, Expressive-тема) — отдельная задача после
-       стабилизации; 2025.09.01 = material3 1.4.0 на compose 1.9. */
-    def composeBom = platform('androidx.compose:compose-bom:2025.09.01')
+    /* BOM 2026.06.01 = compose-ui 1.11.4. The Expressive API (MaterialExpressiveTheme,
+       MotionScheme.expressive, LoadingIndicator, MaterialShapes) lives only in
+       material3 1.5.0-alpha/beta, so material3 is pinned explicitly.
+       1.5.0-alpha18 is the newest line that still builds with AGP 8.13 / compileSdk 36:
+       alpha19+ (and 1.5.0-beta01, BOM 2026.09.00 = compose 1.12) require AGP 9.1 and
+       compileSdk 37. Unpin once those are adopted and 1.5.0 is stable. */
+    def composeBom = platform('androidx.compose:compose-bom:2026.06.01')
     implementation composeBom
     implementation 'androidx.compose.ui:ui'
-    implementation 'androidx.compose.material3:material3'
-    implementation 'androidx.compose.material3:material3-window-size-class'
-    /* adaptive-navigation-suite (NavigationSuiteScaffold): BOM 1.4.0, требует minSdk 23 */
-    implementation 'androidx.compose.material3:material3-adaptive-navigation-suite'
+    implementation 'androidx.compose.material3:material3:1.5.0-alpha18'
+    /* adaptive-navigation-suite (NavigationSuiteScaffold) requires minSdk 23 */
+    implementation 'androidx.compose.material3:material3-adaptive-navigation-suite:1.5.0-alpha18'
     implementation 'androidx.compose.material:material-icons-extended'
     implementation 'androidx.activity:activity-compose:1.11.0'
-    implementation 'androidx.navigation:navigation-compose:2.9.4'
 
     debugImplementation 'androidx.compose.ui:ui-tooling'
     implementation 'androidx.compose.ui:ui-tooling-preview'