fix: stabilize adaptive navigation state

android/app/src/androidTest/kotlin/com/flagship/abox/manager/ui/navigation/AuthenticatedNavigationRoutingTest.kt

@@ -0,0 +1,215 @@
+package com.flagship.abox.manager.ui.navigation
+
+import androidx.activity.ComponentActivity
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.material3.Button
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.key
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.test.assertTextEquals
+import androidx.compose.ui.test.junit4.StateRestorationTester
+import androidx.compose.ui.test.junit4.createAndroidComposeRule
+import androidx.compose.ui.test.onNodeWithTag
+import androidx.compose.ui.test.performClick
+import androidx.test.ext.junit.runners.AndroidJUnit4
+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.designsystem.ABoxTheme
+import com.flagship.abox.manager.domain.DeviceName
+import com.flagship.abox.manager.domain.DeviceType
+import com.flagship.abox.manager.domain.ProviderProfileId
+import com.flagship.abox.manager.ui.shell.ABoxWindowSizeClass
+import com.flagship.abox.manager.ui.shell.DeviceSelection
+import com.flagship.abox.manager.ui.shell.DetailPresentation
+import com.flagship.abox.manager.ui.shell.MainTab
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class AuthenticatedNavigationRoutingTest {
+    @get:Rule
+    val composeRule = createAndroidComposeRule<ComponentActivity>()
+
+    @Test
+    fun compactDetailBackPopsDetailBeforeParentDestination() {
+        composeRule.setContent { ABoxTheme { RoutingFixture() } }
+
+        composeRule.onNodeWithTag("routing_select_device").performClick()
+        composeRule.onNodeWithTag("routing_full_screen_detail").assertExists()
+
+        composeRule.runOnUiThread {
+            composeRule.activity.onBackPressedDispatcher.onBackPressed()
+        }
+        composeRule.waitForIdle()
+
+        composeRule.onNodeWithTag("routing_full_screen_detail").assertDoesNotExist()
+        composeRule.onNodeWithTag("routing_devices_root").assertExists()
+        composeRule.onNodeWithTag("routing_presentation").assertTextEquals("NONE")
+    }
+
+    @Test
+    fun reselectingTabPopsActualNavControllerToItsRoot() {
+        composeRule.setContent { ABoxTheme { RoutingFixture() } }
+
+        composeRule.onNodeWithTag("routing_scenes_tab").performClick()
+        composeRule.onNodeWithTag("routing_scene_child").performClick()
+        composeRule.onNodeWithTag("routing_scenes_tab").performClick()
+        composeRule.waitForIdle()
+
+        composeRule.onNodeWithTag("routing_scenes_root").assertExists()
+        composeRule.onNodeWithTag("routing_scene_child_destination").assertDoesNotExist()
+    }
+
+    @Test
+    fun resizeReconcilesActualRouteAndPaneFromOneSavedSelection() {
+        composeRule.setContent {
+            ABoxTheme {
+                RoutingFixture(initialWindowSizeClass = ABoxWindowSizeClass.EXPANDED)
+            }
+        }
+
+        composeRule.onNodeWithTag("routing_select_device").performClick()
+        composeRule.onNodeWithTag("routing_route").assertTextEquals(MainTab.DEVICES.route)
+        composeRule.onNodeWithTag("routing_presentation").assertTextEquals(DetailPresentation.PANE.name)
+        composeRule.onNodeWithTag("routing_pane_detail").assertExists()
+        composeRule.onNodeWithTag("routing_full_screen_detail").assertDoesNotExist()
+
+        composeRule.onNodeWithTag("routing_toggle_size").performClick()
+        composeRule.waitForIdle()
+        composeRule.onNodeWithTag("routing_full_screen_detail").assertExists()
+        composeRule.onNodeWithTag("routing_route").assertTextEquals("test/device/socket")
+        composeRule.onNodeWithTag("routing_presentation").assertTextEquals(DetailPresentation.FULL_SCREEN.name)
+        composeRule.onNodeWithTag("routing_pane_detail").assertDoesNotExist()
+
+        composeRule.onNodeWithTag("routing_toggle_size").performClick()
+        composeRule.waitForIdle()
+        composeRule.onNodeWithTag("routing_pane_detail").assertExists()
+        composeRule.onNodeWithTag("routing_full_screen_detail").assertDoesNotExist()
+        composeRule.onNodeWithTag("routing_route").assertTextEquals(MainTab.DEVICES.route)
+        composeRule.onNodeWithTag("routing_presentation").assertTextEquals(DetailPresentation.PANE.name)
+    }
+
+    @Test
+    fun savedSelectionSurvivesStateRestorationAndProfileReplacementClearsIt() {
+        val restorationTester = StateRestorationTester(composeRule)
+        restorationTester.setContent {
+            ABoxTheme {
+                RoutingFixture(initialWindowSizeClass = ABoxWindowSizeClass.EXPANDED)
+            }
+        }
+
+        composeRule.onNodeWithTag("routing_select_device").performClick()
+        composeRule.onNodeWithTag("routing_presentation").assertTextEquals(DetailPresentation.PANE.name)
+
+        restorationTester.emulateSavedInstanceStateRestore()
+        composeRule.onNodeWithTag("routing_presentation").assertTextEquals(DetailPresentation.PANE.name)
+        composeRule.onNodeWithTag("routing_pane_detail").assertExists()
+
+        composeRule.onNodeWithTag("routing_replace_profile").performClick()
+        composeRule.waitForIdle()
+        composeRule.onNodeWithTag("routing_presentation").assertTextEquals("NONE")
+        composeRule.onNodeWithTag("routing_route").assertTextEquals(MainTab.DEVICES.route)
+        composeRule.onNodeWithTag("routing_pane_detail").assertDoesNotExist()
+    }
+}
+
+@Composable
+private fun RoutingFixture(
+    initialWindowSizeClass: ABoxWindowSizeClass = ABoxWindowSizeClass.COMPACT,
+) {
+    var windowSizeClass by remember { mutableStateOf(initialWindowSizeClass) }
+    var profileId by remember { mutableStateOf(ProviderProfileId("profile")) }
+
+    Column(modifier = Modifier.fillMaxSize()) {
+        Button(
+            onClick = {
+                windowSizeClass = if (windowSizeClass == ABoxWindowSizeClass.COMPACT) {
+                    ABoxWindowSizeClass.EXPANDED
+                } else {
+                    ABoxWindowSizeClass.COMPACT
+                }
+            },
+            modifier = Modifier.testTag("routing_toggle_size"),
+        ) { Text("Resize") }
+        Button(
+            onClick = { profileId = ProviderProfileId("replacement") },
+            modifier = Modifier.testTag("routing_replace_profile"),
+        ) { Text("Replace profile") }
+
+        key(profileId.value) {
+            val navController = rememberNavController()
+            AuthenticatedNavigationStateHost(
+                profileId = profileId,
+                windowSizeClass = windowSizeClass,
+                navController = navController,
+                deviceRoute = { "test/device/${it.deviceName.value}" },
+                selectionForRoute = { route ->
+                    route
+                        ?.takeIf { it.startsWith("test/device/") }
+                        ?.removePrefix("test/device/")
+                        ?.let { deviceName ->
+                            DeviceSelection(
+                                profileId = profileId,
+                                deviceName = DeviceName(deviceName),
+                                type = DeviceType.SOCKET,
+                            )
+                        }
+                },
+            ) { snapshot, onTabClick, onSelectDevice, _ ->
+                Text(snapshot.currentRoute.orEmpty(), modifier = Modifier.testTag("routing_route"))
+                Text(
+                    snapshot.detailPresentation?.name ?: "NONE",
+                    modifier = Modifier.testTag("routing_presentation"),
+                )
+                Button(
+                    onClick = { onSelectDevice(DeviceName("socket"), DeviceType.SOCKET) },
+                    modifier = Modifier.testTag("routing_select_device"),
+                ) { Text("Select") }
+                Button(
+                    onClick = { onTabClick(MainTab.SCENES) },
+                    modifier = Modifier.testTag("routing_scenes_tab"),
+                ) { Text("Scenes") }
+                Button(
+                    onClick = { navController.navigate("scene/child") },
+                    modifier = Modifier.testTag("routing_scene_child"),
+                ) { Text("Child") }
+
+                if (snapshot.detailPresentation == DetailPresentation.PANE) {
+                    Text("Pane detail", modifier = Modifier.testTag("routing_pane_detail"))
+                }
+
+                NavHost(
+                    navController = navController,
+                    startDestination = MainTab.DEVICES.route,
+                ) {
+                    composable(MainTab.DEVICES.route) {
+                        Text("Devices", modifier = Modifier.testTag("routing_devices_root"))
+                    }
+                    composable(MainTab.SCENES.route) {
+                        Text("Scenes", modifier = Modifier.testTag("routing_scenes_root"))
+                    }
+                    composable("scene/child") {
+                        Text("Child", modifier = Modifier.testTag("routing_scene_child_destination"))
+                    }
+                    composable(
+                        route = "test/device/{deviceName}",
+                        arguments = listOf(navArgument("deviceName") { type = NavType.StringType }),
+                    ) {
+                        Text("Full screen detail", modifier = Modifier.testTag("routing_full_screen_detail"))
+                    }
+                }
+            }
+        }
+    }
+}

android/app/src/androidTest/kotlin/com/flagship/abox/manager/ui/shell/MainAppShellTest.kt

@@ -5,7 +5,7 @@ import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.material3.Text
 import androidx.compose.ui.test.assertIsDisplayed
 import androidx.compose.ui.test.junit4.createAndroidComposeRule
-import androidx.compose.ui.test.onAllNodesWithText
+import androidx.compose.ui.test.onNodeWithTag
 import androidx.compose.ui.test.onNodeWithText
 import androidx.compose.ui.test.performClick
 import androidx.test.ext.junit.runners.AndroidJUnit4
@@ -38,8 +38,8 @@ class MainAppShellTest {
             }
         }
 
-        composeRule.onAllNodesWithText("Devices")[0].assertIsDisplayed()
+        composeRule.onNodeWithTag("main_tab_devices").assertIsDisplayed()
-        composeRule.onAllNodesWithText("Scenes")[0].performClick()
+        composeRule.onNodeWithTag("main_tab_scenes").performClick()
 
         assertEquals(MainTab.SCENES, selectedTab)
     }
@@ -83,8 +83,8 @@ class MainAppShellTest {
             }
         }
 
-        composeRule.onNodeWithText("ABox").performClick()
+        composeRule.onNodeWithTag("main_provider_pill").performClick()
-        composeRule.onNodeWithText("U").performClick()
+        composeRule.onNodeWithTag("main_avatar").performClick()
 
         assertEquals(1, providerClicks)
         assertEquals(1, avatarClicks)

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

@@ -15,12 +15,15 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.key
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.Saver
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import androidx.navigation.NavBackStackEntry
 import androidx.navigation.NavHostController
 import androidx.navigation.NavType
 import androidx.navigation.compose.NavHost
@@ -55,12 +58,14 @@ import com.flagship.abox.manager.ui.socket.SocketViewModel
 import com.flagship.abox.manager.ui.temperaturehumidity.TemperatureHumidityScreen
 import com.flagship.abox.manager.ui.temperaturehumidity.TemperatureHumidityUiEvent
 import com.flagship.abox.manager.ui.temperaturehumidity.TemperatureHumidityViewModel
+import java.net.URLDecoder
+import java.nio.charset.StandardCharsets
 
 /** Pure authenticated graph state for tab, detail, and profile continuity tests. */
 data class AuthenticatedGraphState(
     val profileId: ProviderProfileId,
     val currentTab: MainTab = MainTab.DEVICES,
-    private val backStacks: Map<MainTab, List<String>> = MainTab.values().associateWith { listOf(it.route) },
+    private val backStacks: Map<MainTab, List<String>> = MainTab.entries.associateWith { listOf(it.route) },
     val selectedDevice: DeviceSelection? = null,
 ) {
     fun selectTab(tab: MainTab): AuthenticatedGraphState {
@@ -99,65 +104,90 @@ data class AuthenticatedGraphState(
     }
 }
 
-@Composable
+data class AuthenticatedNavigationSnapshot(
-fun AuthenticatedNavigation(
+    val currentRoute: String?,
-    username: Username,
+    val selectedDevice: DeviceSelection?,
-    profile: ProviderProfile,
+    val detailPresentation: DetailPresentation?,
-    onLogout: () -> Unit,
+)
-    onProviderClick: () -> Unit,
-    onAvatarClick: () -> Unit,
-    windowSizeClass: ABoxWindowSizeClass? = null,
-) {
-    val resolvedWindowSizeClass = windowSizeClass ?: widthClass(LocalConfiguration.current.screenWidthDp)
-    key(profile.id.value) {
-        AuthenticatedNavigationContent(
-            username = username,
-            profile = profile,
-            onLogout = onLogout,
-            onProviderClick = onProviderClick,
-            onAvatarClick = onAvatarClick,
-            windowSizeClass = resolvedWindowSizeClass,
-        )
-    }
-}
 
+private val NullableDeviceSelectionSaver: Saver<DeviceSelection?, Any> = DeviceSelection.Saver
+
+
+/**
+ * Navigation-owned state host. The authenticated graph and routing tests share this exact state
+ * machine so saved selection, route transitions, resize reconciliation, and BackHandler behavior
+ * cannot drift apart.
+ */
 @Composable
-private fun AuthenticatedNavigationContent(
+fun AuthenticatedNavigationStateHost(
-    username: Username,
+    profileId: ProviderProfileId,
-    profile: ProviderProfile,
-    onLogout: () -> Unit,
-    onProviderClick: () -> Unit,
-    onAvatarClick: () -> Unit,
     windowSizeClass: ABoxWindowSizeClass,
+    navController: NavHostController,
+    deviceRoute: (DeviceSelection) -> String,
+    selectionForRoute: (String?) -> DeviceSelection? = { null },
+    content: @Composable (
+        snapshot: AuthenticatedNavigationSnapshot,
+        onTabClick: (MainTab) -> Unit,
+        onSelectDevice: (DeviceName, DeviceType) -> Unit,
+        onClearDeviceSelection: () -> Unit,
+    ) -> Unit,
 ) {
-    val navController = rememberNavController()
-    var selectedDevice by remember { mutableStateOf<DeviceSelection?>(null) }
     val backStackEntry by navController.currentBackStackEntryAsState()
-    val currentRoute = backStackEntry?.destination?.route
+    val currentRoute = backStackEntry?.actualRoute()
+    val routeSelection = selectionForRoute(currentRoute)?.takeIf { it.profileId == profileId }
+    var savedSelection by rememberSaveable(
+        profileId.value,
+        stateSaver = NullableDeviceSelectionSaver,
+    ) {
+        mutableStateOf<DeviceSelection?>(null)
+    }
     val currentTab = MainTab.fromRoute(currentRoute) ?: MainTab.DEVICES
-    val selectedDetailPresentation = selectedDevice?.let {
+    val selectedDevice = when {
+        routeSelection != null -> routeSelection
+        currentRoute == MainTab.DEVICES.route -> savedSelection?.takeIf { it.profileId == profileId }
+        else -> null
+    }
+    val selectedPresentation = selectedDevice?.let {
         detailPresentation(windowSizeClass, it)
     }
-    val isExpandedDevicePane = selectedDevice != null &&
-        selectedDetailPresentation == DetailPresentation.PANE &&
-        currentTab == MainTab.DEVICES
 
-    BackHandler(enabled = navController.previousBackStackEntry != null || selectedDevice != null) {
+    LaunchedEffect(profileId, currentRoute, selectedDevice, windowSizeClass) {
-        if (selectedDevice != null && selectedDetailPresentation == DetailPresentation.PANE) {
+        if (savedSelection?.profileId != null && savedSelection?.profileId != profileId) {
-            selectedDevice = null
+            savedSelection = null
-        } else {
+            return@LaunchedEffect
-            selectedDevice = null
+        }
-            navController.popBackStack()
+
+        val selection = selectedDevice ?: return@LaunchedEffect
+        if (savedSelection != selection) {
+            savedSelection = selection
+        }
+
+        when (detailPresentation(windowSizeClass, selection)) {
+            DetailPresentation.PANE -> {
+                if (currentRoute != MainTab.DEVICES.route) {
+                    navController.popBackStack(MainTab.DEVICES.route, inclusive = false)
+                }
+            }
+            DetailPresentation.FULL_SCREEN -> {
+                if (currentRoute == MainTab.DEVICES.route) {
+                    navController.navigate(deviceRoute(selection)) {
+                        launchSingleTop = true
+                    }
+                }
+            }
         }
     }
 
-    MainAppShell(
+    val snapshot = AuthenticatedNavigationSnapshot(
-        currentTab = currentTab,
+        currentRoute = currentRoute,
-        windowSizeClass = windowSizeClass,
+        selectedDevice = selectedDevice,
-        userName = username.value,
+        detailPresentation = selectedPresentation,
-        providerName = profile.displayName,
+    )
-        onTabClick = { tab ->
+
-            selectedDevice = null
+    content(
+        snapshot,
+        { tab ->
+            savedSelection = null
             if (tab == currentTab) {
                 navController.popBackStack(tab.route, inclusive = false)
             } else {
@@ -170,6 +200,55 @@ private fun AuthenticatedNavigationContent(
                 }
             }
         },
+        { deviceName, type ->
+            savedSelection = DeviceSelection(profileId, deviceName, type)
+        },
+        { savedSelection = null },
+    )
+
+    BackHandler(enabled = selectedDevice != null || navController.previousBackStackEntry != null) {
+        savedSelection = null
+        if (currentRoute != MainTab.DEVICES.route) {
+            navController.popBackStack()
+        }
+    }
+}
+
+@Composable
+fun AuthenticatedNavigation(
+    username: Username,
+    profile: ProviderProfile,
+    onLogout: () -> Unit,
+    onProviderClick: () -> Unit,
+    onAvatarClick: () -> Unit,
+    windowSizeClass: ABoxWindowSizeClass? = null,
+) {
+    val resolvedWindowSizeClass = windowSizeClass ?: widthClass(LocalConfiguration.current.screenWidthDp)
+    key(profile.id.value) {
+        val navController = rememberNavController()
+        AuthenticatedNavigationStateHost(
+            profileId = profile.id,
+            windowSizeClass = resolvedWindowSizeClass,
+            navController = navController,
+            deviceRoute = { selection ->
+                when (selection.type) {
+                    DeviceType.SOCKET -> DeviceDetailRoutes.socketRoute(profile.id, selection.deviceName)
+                    DeviceType.TEMPERATURE_HUMIDITY -> DeviceDetailRoutes.temperatureHumidityRoute(
+                        profile.id,
+                        selection.deviceName,
+                    )
+                    DeviceType.INFRARED -> "${Routes.INFRARED_HUB}/${Uri.encode(profile.id.value)}"
+                }
+            },
+            selectionForRoute = { route -> profile.selectionForRoute(route) },
+        ) { snapshot, onTabClick, onSelectDevice, onClearDeviceSelection ->
+            val currentTab = MainTab.fromRoute(snapshot.currentRoute) ?: MainTab.DEVICES
+            MainAppShell(
+                currentTab = currentTab,
+                windowSizeClass = resolvedWindowSizeClass,
+                userName = username.value,
+                providerName = profile.displayName,
+                onTabClick = onTabClick,
                 onProviderClick = onProviderClick,
                 onAvatarClick = onAvatarClick,
                 content = { paddingValues ->
@@ -177,25 +256,17 @@ private fun AuthenticatedNavigationContent(
                         navController = navController,
                         profile = profile,
                         paddingValues = paddingValues,
-                isExpandedDevicePane = isExpandedDevicePane,
+                        isExpandedDevicePane = snapshot.detailPresentation == DetailPresentation.PANE &&
-                selectedDevice = selectedDevice,
+                            snapshot.currentRoute == MainTab.DEVICES.route,
-                onSelectDevice = { deviceName, type ->
+                        selectedDevice = snapshot.selectedDevice,
-                    val selection = DeviceSelection(profile.id, deviceName, type)
+                        onSelectDevice = onSelectDevice,
-                    selectedDevice = selection
+                        onClearDeviceSelection = onClearDeviceSelection,
-                    val route = when (type) {
-                        DeviceType.SOCKET -> DeviceDetailRoutes.socketRoute(profile.id, deviceName)
-                        DeviceType.TEMPERATURE_HUMIDITY -> DeviceDetailRoutes.temperatureHumidityRoute(profile.id, deviceName)
-                        DeviceType.INFRARED -> "${Routes.INFRARED_HUB}/${Uri.encode(profile.id.value)}"
-                    }
-                    if (detailPresentation(windowSizeClass, selection) == DetailPresentation.FULL_SCREEN) {
-                        navController.navigate(route)
-                    }
-                },
-                onClearDeviceSelection = { selectedDevice = null },
                         onLogout = onLogout,
                     )
                 },
             )
+        }
+    }
 }
 
 @Composable
@@ -214,7 +285,7 @@ private fun AuthenticatedGraphContent(
             .fillMaxSize()
             .padding(paddingValues),
     ) {
-        if (isExpandedDevicePane) {
+        if (isExpandedDevicePane && selectedDevice != null) {
             Row(modifier = Modifier.fillMaxSize()) {
                 AuthenticatedNavHost(
                     modifier = Modifier.weight(1f),
@@ -226,7 +297,7 @@ private fun AuthenticatedGraphContent(
                 )
                 DeviceDetailPane(
                     modifier = Modifier.weight(1f),
-                    selection = requireNotNull(selectedDevice),
+                    selection = selectedDevice,
                     onBack = onClearDeviceSelection,
                 )
             }
@@ -347,9 +418,10 @@ private fun DeviceDetailPane(
     onBack: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
+    val viewModelKey = "${selection.profileId.value}:${selection.deviceName.value}:${selection.type.name}"
     when (selection.type) {
         DeviceType.SOCKET -> {
-            val viewModel: SocketViewModel = hiltViewModel()
+            val viewModel: SocketViewModel = hiltViewModel(key = viewModelKey)
             val state by viewModel.state.collectAsStateWithLifecycle()
             LaunchedEffect(selection) {
                 viewModel.onEvent(SocketUiEvent.Initialize(selection.profileId, selection.deviceName))
@@ -362,7 +434,7 @@ private fun DeviceDetailPane(
             )
         }
         DeviceType.TEMPERATURE_HUMIDITY -> {
-            val viewModel: TemperatureHumidityViewModel = hiltViewModel()
+            val viewModel: TemperatureHumidityViewModel = hiltViewModel(key = viewModelKey)
             val state by viewModel.state.collectAsStateWithLifecycle()
             LaunchedEffect(selection) {
                 viewModel.onEvent(
@@ -389,3 +461,39 @@ private fun ActivityDestination() {
         )
     }
 }
+
+private fun ProviderProfile.selectionForRoute(route: String?): DeviceSelection? {
+    val parts = route?.split('/') ?: return null
+    return when {
+        parts.size >= 4 && parts[0] == "device" && parts[1] == "socket" -> DeviceSelection(
+            profileId = id,
+            deviceName = DeviceName(parts.drop(3).joinToString("/").decodeRoutePart()),
+            type = DeviceType.SOCKET,
+        )
+        parts.size >= 4 && parts[0] == "device" && parts[1] == "th" -> DeviceSelection(
+            profileId = id,
+            deviceName = DeviceName(parts.drop(3).joinToString("/").decodeRoutePart()),
+            type = DeviceType.TEMPERATURE_HUMIDITY,
+        )
+        parts.size >= 2 && parts[0] == Routes.INFRARED_HUB -> DeviceSelection(
+            profileId = id,
+            deviceName = DeviceName("红外遥控器"),
+            type = DeviceType.INFRARED,
+        )
+        else -> null
+    }
+}
+
+private fun String.decodeRoutePart(): String = runCatching {
+    URLDecoder.decode(this, StandardCharsets.UTF_8.name())
+}.getOrDefault(this)
+
+private fun NavBackStackEntry.actualRoute(): String? {
+    var route = destination.route ?: return null
+    destination.arguments.keys.forEach { argumentName ->
+        arguments?.getString(argumentName)?.let { value ->
+            route = route.replace("{$argumentName}", Uri.encode(value))
+        }
+    }
+    return route
+}

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

@@ -1,6 +1,7 @@
 package com.flagship.abox.manager.ui.shell
 
 import androidx.compose.runtime.Immutable
+import androidx.compose.runtime.saveable.Saver
 import com.flagship.abox.manager.domain.DeviceName
 import com.flagship.abox.manager.domain.DeviceType
 import com.flagship.abox.manager.domain.ProviderProfileId
@@ -35,7 +36,32 @@ data class DeviceSelection(
     val profileId: ProviderProfileId,
     val deviceName: DeviceName,
     val type: DeviceType,
-)
+) {
+    companion object {
+        /** Saver used by navigation-owned state so selection survives recreation and resize. */
+        val Saver: Saver<DeviceSelection?, Any> = Saver(
+            save = { selection ->
+                selection?.let {
+                    listOf(it.profileId.value, it.deviceName.value, it.type.name)
+                }
+            },
+            restore = { saved ->
+                val values = saved as? List<*> ?: return@Saver null
+                if (values.size != 3) return@Saver null
+                val profileId = values[0] as? String ?: return@Saver null
+                val deviceName = values[1] as? String ?: return@Saver null
+                val type = (values[2] as? String)?.let { value ->
+                    runCatching { DeviceType.valueOf(value) }.getOrNull()
+                } ?: return@Saver null
+                DeviceSelection(
+                    profileId = ProviderProfileId(profileId),
+                    deviceName = DeviceName(deviceName),
+                    type = type,
+                )
+            },
+        )
+    }
+}
 
 enum class DetailPresentation {
     FULL_SCREEN,

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

@@ -26,6 +26,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
@@ -63,11 +64,12 @@ fun MainAppShell(
         bottomBar = {
             if (!useRail) {
                 ABoxNavigationBar {
-                    MainTab.values().forEach { tab ->
+                    MainTab.entries.forEach { tab ->
                         val selected = tab == currentTab
                         ABoxNavigationBarItem(
                             selected = selected,
                             onClick = { onTabClick(tab) },
+                            modifier = Modifier.testTag("main_tab_${tab.name.lowercase()}"),
                             icon = {
                                 Icon(
                                     imageVector = if (selected) tab.selectedIcon else tab.unselectedIcon,
@@ -127,6 +129,7 @@ private fun ProviderTopBar(
                 Row(
                     modifier = Modifier
                         .clip(RoundedCornerShape(24.dp))
+                        .testTag("main_provider_pill")
                         .clickable(
                             onClickLabel = stringResource(R.string.account_sheet_provider),
                             onClick = onProviderClick,
@@ -159,6 +162,7 @@ private fun ProviderTopBar(
                         .weight(1f)
                         .padding(horizontal = 8.dp),
                 )
+                Box(modifier = Modifier.testTag("main_avatar")) {
                     ABoxUserAvatar(
                         name = userName,
                         onClick = onAvatarClick,
@@ -168,6 +172,7 @@ private fun ProviderTopBar(
                 }
             }
         }
+    }
 }
 
 @Composable
@@ -180,11 +185,12 @@ private fun MainNavigationRail(
         containerColor = MaterialTheme.colorScheme.surface,
     ) {
         Spacer(modifier = Modifier.height(8.dp))
-        MainTab.values().forEach { tab ->
+        MainTab.entries.forEach { tab ->
             val selected = tab == currentTab
             NavigationRailItem(
                 selected = selected,
                 onClick = { onTabClick(tab) },
+                modifier = Modifier.testTag("main_tab_${tab.name.lowercase()}"),
                 icon = {
                     Icon(
                         imageVector = if (selected) tab.selectedIcon else tab.unselectedIcon,

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

@@ -40,9 +40,10 @@ enum class MainTab(
 
     companion object {
         fun fromRoute(route: String?): MainTab? = when {
-            route == DEVICES.route || route?.startsWith("device/") == true ||
+            route == null -> null
-                route?.startsWith("infrared_") == true -> DEVICES
+            route == DEVICES.route || route.startsWith("device/") ||
-            route == SCENES.route || route?.startsWith("scene/") == true -> SCENES
+                route.startsWith("infrared_") -> DEVICES
+            route == SCENES.route || route.startsWith("scene/") -> SCENES
             route == ACTIVITY.route -> ACTIVITY
             else -> null
         }

android/app/src/test/kotlin/com/flagship/abox/manager/ui/shell/MainTabTest.kt

@@ -9,7 +9,7 @@ class MainTabTest {
 
     @Test
     fun `all main tabs have distinct non-empty routes and valid label resources`() {
-        val tabs = MainTab.values()
+        val tabs = MainTab.entries
         assertEquals(3, tabs.size)
 
         val routes = tabs.map { it.route }