feat(scene): integrate scene navigation host into authenticated MainAppShell

android/app/src/main/kotlin/com/flagship/abox/manager/ui/ABoxManagerApp.kt

@@ -17,6 +17,7 @@ import com.flagship.abox.manager.designsystem.ABoxTheme
 import com.flagship.abox.manager.ui.login.LoginRoute
 import com.flagship.abox.manager.ui.login.LoginViewModel
 import com.flagship.abox.manager.ui.provider.ProviderSelectionRoute
+import com.flagship.abox.manager.ui.scene.SceneNavHost
 import com.flagship.abox.manager.ui.session.AppSessionUiState
 import com.flagship.abox.manager.ui.session.AppSessionViewModel
 import com.flagship.abox.manager.ui.session.SessionActionsViewModel
@@ -63,6 +64,9 @@ fun ABoxManagerApp(
                     onLogout = sessionActionsViewModel::logout,
                     actionInProgress = actionState.inProgress,
                     errorMessage = actionState.errorMessage,
+                    scenesSlot = {
+                        SceneNavHost()
+                    },
                 )
             }
         }

android/app/src/main/kotlin/com/flagship/abox/manager/ui/scene/SceneEditorScreen.kt

@@ -13,7 +13,7 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material.icons.filled.Delete
 import androidx.compose.material3.AssistChip
 import androidx.compose.material3.Button
@@ -74,7 +74,7 @@ fun SceneEditorScreen(
                 },
                 navigationIcon = {
                     IconButton(onClick = onBack) {
-                        Icon(Icons.Filled.ArrowBack, contentDescription = stringResource(R.string.scene_back))
+                        Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = stringResource(R.string.scene_back))
                     }
                 },
             )

android/app/src/main/kotlin/com/flagship/abox/manager/ui/scene/SceneExecutionScreen.kt

@@ -12,7 +12,7 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material.icons.filled.Check
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material3.Button
@@ -56,7 +56,7 @@ fun SceneExecutionScreen(
                 title = { Text(stringResource(R.string.scene_execution_title)) },
                 navigationIcon = {
                     IconButton(onClick = onBack) {
-                        Icon(Icons.Filled.ArrowBack, contentDescription = stringResource(R.string.scene_back))
+                        Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = stringResource(R.string.scene_back))
                     }
                 },
             )

android/app/src/main/kotlin/com/flagship/abox/manager/ui/scene/SceneNavigation.kt

@@ -1,14 +1,18 @@
 package com.flagship.abox.manager.ui.scene
 
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
 import androidx.navigation.NavGraphBuilder
+import androidx.navigation.NavHostController
 import androidx.navigation.NavType
+import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
+import androidx.navigation.compose.rememberNavController
 import androidx.navigation.navArgument
 import com.flagship.abox.manager.domain.SceneId
 
 /**
- * Scene navigation routes. [SceneListRoute] is the entry point; the editor and execution routes
+ * Scene navigation routes. [SceneRoutes.LIST] is the entry point; the editor and execution routes
  * carry the scene id as a path segment so deep linking works without manual argument parsing.
  */
 object SceneRoutes {
@@ -21,6 +25,36 @@ object SceneRoutes {
     fun executionFor(sceneId: SceneId): String = "scene/execution/${sceneId.value}"
 }
 
+/**
+ * Embedded navigation host for the scenes tab in [MainAppShell].
+ */
+@Composable
+fun SceneNavHost(
+    modifier: Modifier = Modifier,
+    navController: NavHostController = rememberNavController(),
+) {
+    NavHost(
+        navController = navController,
+        startDestination = SceneRoutes.LIST,
+        modifier = modifier,
+    ) {
+        sceneListDestination(
+            onAddScene = { navController.navigate(SceneRoutes.EDITOR) },
+            onEditScene = { sceneId -> navController.navigate(SceneRoutes.editorFor(sceneId)) },
+            onExecuteScene = { sceneId -> navController.navigate(SceneRoutes.executionFor(sceneId)) },
+        )
+        sceneEditorDestination(
+            onBack = { navController.popBackStack() },
+            onSaved = {
+                navController.popBackStack(SceneRoutes.LIST, inclusive = false)
+            },
+        )
+        sceneExecutionDestination(
+            onBack = { navController.popBackStack() },
+        )
+    }
+}
+
 fun NavGraphBuilder.sceneListDestination(
     onAddScene: () -> Unit,
     onEditScene: (SceneId) -> Unit,

domain/build.gradle.kts

@@ -11,3 +11,4 @@ dependencies {
     testImplementation(libs.junit)
     testImplementation(libs.kotlinx.coroutines.test)
 }
+