android: 2.14.0 - minSdk 23 + adaptive navigation (Stage 3)

- minSdkVersion 21 -> 23 (device is Android 17, no other users); jni
  Application.mk: APP_PLATFORM android-23 + -DHAVE_SIGWAITINFO (the NDK
  sysroot declares sigwaitinfo since API 23, conflicting with strongSwan's
  fallback prototype; the system implementation is used now)
- replace the bottom NavigationBar with NavigationSuiteScaffold (bottom bar
  on phones, navigation rail in landscape/on tablets); item colors keep the
  brand palette via NavigationSuiteItemColors(bar/rail/drawer)
- HomeScreen applies statusBarsPadding itself (the adaptive scaffold no
  longer pads the content area)
- predictive back was already enabled (android:enableOnBackInvokedCallback)

src/frontends/android/app/build.gradle

@@ -34,11 +34,11 @@ android {
     defaultConfig {
         applicationId "one.shx.strongswan.ext"
         compileSdk = 36
-        minSdkVersion 21
+        minSdkVersion 23
         targetSdkVersion 36
 
-        versionCode 152
-        versionName "2.13.15"
+        versionCode 153
+        versionName "2.14.0"
 
         /* Base URL of the update storage, trailing slash included */
         buildConfigField "String", "UPDATE_BASE_URL", "\"${updateBaseUrl}\""
@@ -146,15 +146,15 @@ 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) требует minSdk 23 — приложение поддерживает API 21.
-       2025.09.01 = первый BOM с material3 1.4.0 (Expressive) на compose 1.9 (minSdk 21). */
+    /* 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')
     implementation composeBom
     implementation 'androidx.compose.ui:ui'
     implementation 'androidx.compose.material3:material3'
     implementation 'androidx.compose.material3:material3-window-size-class'
-    /* adaptive-navigation-suite требует minSdk 23 (adaptive:1.2.0) — подключить на этапе 3
-       вместе с решением о minSdk; сейчас приложение поддерживает API 21 */
+    /* adaptive-navigation-suite (NavigationSuiteScaffold): BOM 1.4.0, требует minSdk 23 */
+    implementation 'androidx.compose.material3:material3-adaptive-navigation-suite'
     implementation 'androidx.compose.material:material-icons-extended'
     implementation 'androidx.activity:activity-compose:1.11.0'
     implementation 'androidx.navigation:navigation-compose:2.9.4'