feat(app): add authenticated app shell with top bar and bottom navigation (#6)

### 概述 / Summary
实现认证后的主应用壳层（`MainAppShell`），包含胶囊顶栏（`ABoxTopPillBar`）与 Material 3 底部导航栏（`ABoxNavigationBar`），并为团队其他成员预留标准 Composable 插槽。

### 核心变更 / Changes
1. **设计系统 (`:android:core:designsystem`)**：
   - 新增 `ABoxTopPillBar`：展示提供方/空间信息、快捷 `+` 操作与用户头像徽标。
   - 新增 `ABoxUserAvatar`：支持用户名首字符与主题强调轮廓。
   - 新增 `ABoxNavigationBar` & `ABoxNavigationBarItem`：M3 胶囊指示器底部导航栏封装。
2. **应用壳层 (`:android:app`)**：
   - 新增 `MainTab`（`DEVICES`, `SCENES`, `ACTIVITY`），严格对齐需求与分工术语。
   - 新增 `MainAppShell`：承载顶栏、底栏、Tab 平滑切换，并开放 `devicesSlot`、`scenesSlot`、`activitySlot`。
   - 新增 `AccountProviderBottomSheet`：点击头像展示当前会话/提供方信息、支持切换提供方与退出登录。
3. **多语言与测试**：
   - 补充 `values` 与 `values-zh-rCN` 双语资源。
   - 新增 `MainTabTest` 单元测试并通过全量 `check` 与 `test`。

### 分工保护 / Boundaries
- 仅提供顶栏、底栏与主页面容器骨架；
- 设备列表、情景编排与设备控制详情的具体 UI 保持为插槽，供 alZerNest、tzh 和 Aurum 后续无缝填充。

Reviewed-on: #6
Co-authored-by: KremeCN <3265494849@qq.com>

android/app/build.gradle.kts

@@ -79,6 +79,7 @@ dependencies {
     implementation(libs.compose.ui)
     implementation(libs.compose.ui.tooling.preview)
     implementation(libs.compose.material3)
+    implementation(libs.compose.material.icons.extended)
     implementation(libs.hilt.android)
     kapt(libs.hilt.compiler)
 

android/app/src/androidTest/kotlin/com/flagship/abox/manager/ui/login/LoginScreenTest.kt

@@ -1,9 +1,11 @@
 package com.flagship.abox.manager.ui.login
 
 import androidx.activity.ComponentActivity
+import androidx.compose.ui.test.assertCountEquals
 import androidx.compose.ui.test.assertIsEnabled
 import androidx.compose.ui.test.assertIsNotEnabled
 import androidx.compose.ui.test.junit4.createAndroidComposeRule
+import androidx.compose.ui.test.onAllNodesWithText
 import androidx.compose.ui.test.onNodeWithContentDescription
 import androidx.compose.ui.test.onNodeWithText
 import androidx.compose.ui.test.performClick
@@ -29,7 +31,7 @@ class LoginScreenTest {
     )
 
     @Test
-    fun backControlsSwitchProviderBeforeLogin() {
+    fun topBackControlSwitchesProviderBeforeLogin() {
         var switches = 0
         composeRule.setContent {
             ABoxTheme {
@@ -49,8 +51,8 @@ class LoginScreenTest {
         composeRule.onNodeWithContentDescription("back-to-providers")
             .assertIsEnabled()
             .performClick()
-        composeRule.onNodeWithText("Back to providers").performClick()
+        composeRule.onAllNodesWithText("Back to providers").assertCountEquals(0)
-        assertEquals(2, switches)
+        assertEquals(1, switches)
     }
 
     @Test
@@ -94,6 +96,6 @@ class LoginScreenTest {
         }
 
         composeRule.onNodeWithContentDescription("back-to-providers").assertIsNotEnabled()
-        composeRule.onNodeWithText("Back to providers").assertIsNotEnabled()
+        composeRule.onAllNodesWithText("Back to providers").assertCountEquals(0)
     }
 }

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

@@ -14,13 +14,13 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.flagship.abox.manager.designsystem.ABoxLoadingIndicator
 import com.flagship.abox.manager.designsystem.ABoxSurface
 import com.flagship.abox.manager.designsystem.ABoxTheme
-import com.flagship.abox.manager.ui.authenticated.AuthenticatedPlaceholderScreen
 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.session.AppSessionUiState
 import com.flagship.abox.manager.ui.session.AppSessionViewModel
 import com.flagship.abox.manager.ui.session.SessionActionsViewModel
+import com.flagship.abox.manager.ui.shell.MainAppShell
 
 @Composable
 fun ABoxManagerApp(
@@ -57,12 +57,12 @@ fun ABoxManagerApp(
                     onSwitchProvider = sessionActionsViewModel::switchProvider,
                     viewModel = loginViewModel,
                 )
-                is AppSessionUiState.Authenticated -> AuthenticatedPlaceholderScreen(
+                is AppSessionUiState.Authenticated -> MainAppShell(
-                    profile = state.profile,
+                    userName = state.username.value,
+                    providerName = state.profile.displayName,
+                    onLogout = sessionActionsViewModel::logout,
                     actionInProgress = actionState.inProgress,
                     errorMessage = actionState.errorMessage,
-                    onLogout = sessionActionsViewModel::logout,
-                    onSwitchProvider = sessionActionsViewModel::switchProvider,
                 )
             }
         }

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

@@ -1,79 +0,0 @@
-package com.flagship.abox.manager.ui.authenticated
-
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.widthIn
-import androidx.compose.foundation.rememberScrollState
-import androidx.compose.foundation.verticalScroll
-import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Scaffold
-import androidx.compose.material3.Text
-import androidx.compose.material3.TopAppBar
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.unit.dp
-import com.flagship.abox.manager.R
-import com.flagship.abox.manager.designsystem.ABoxButton
-import com.flagship.abox.manager.domain.ProviderProfile
-
-@OptIn(ExperimentalMaterial3Api::class)
-@Composable
-fun AuthenticatedPlaceholderScreen(
-    profile: ProviderProfile,
-    actionInProgress: Boolean,
-    errorMessage: String?,
-    onLogout: () -> Unit,
-    onSwitchProvider: () -> Unit,
-) {
-    Scaffold(
-        topBar = {
-            TopAppBar(
-                title = { Text(stringResource(R.string.authenticated_title, profile.displayName)) },
-            )
-        },
-    ) { contentPadding ->
-        Box(
-            modifier = Modifier
-                .fillMaxSize()
-                .padding(contentPadding),
-            contentAlignment = Alignment.Center,
-        ) {
-            Column(
-                modifier = Modifier
-                    .widthIn(max = 520.dp)
-                    .fillMaxWidth()
-                    .verticalScroll(rememberScrollState())
-                    .padding(24.dp),
-                horizontalAlignment = Alignment.CenterHorizontally,
-                verticalArrangement = Arrangement.spacedBy(14.dp),
-            ) {
-                Text(
-                    text = stringResource(R.string.authenticated_description),
-                    color = MaterialTheme.colorScheme.onSurfaceVariant,
-                )
-                errorMessage?.let { Text(it, color = MaterialTheme.colorScheme.error) }
-                ABoxButton(
-                    onClick = onLogout,
-                    enabled = !actionInProgress,
-                    modifier = Modifier.fillMaxWidth(),
-                ) {
-                    Text(stringResource(R.string.action_logout))
-                }
-                ABoxButton(
-                    onClick = onSwitchProvider,
-                    enabled = !actionInProgress,
-                    modifier = Modifier.fillMaxWidth(),
-                ) {
-                    Text(stringResource(R.string.action_switch_provider))
-                }
-            }
-        }
-    }
-}

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

@@ -184,13 +184,6 @@ fun LoginScreen(
                     }
                     else Text(stringResource(R.string.action_login))
                 }
-                ABoxButton(
-                    onClick = onSwitchProvider,
-                    enabled = navigationEnabled,
-                    modifier = Modifier.fillMaxWidth(),
-                ) {
-                    Text(stringResource(R.string.login_back_to_providers))
-                }
             }
         }
     }

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

@@ -8,6 +8,7 @@ import com.flagship.abox.manager.domain.ProviderProfileId
 import com.flagship.abox.manager.domain.ProviderProfileStore
 import com.flagship.abox.manager.domain.Session
 import com.flagship.abox.manager.domain.SessionCoordinator
+import com.flagship.abox.manager.domain.Username
 import dagger.hilt.android.lifecycle.HiltViewModel
 import javax.inject.Inject
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -99,7 +100,7 @@ class AppSessionViewModel @Inject constructor(
         bootstrapError: String?,
     ): AppSessionUiState = when {
         profile == null -> AppSessionUiState.ProviderSelection
-        session?.profileId == profile.id -> AppSessionUiState.Authenticated(profile)
+        session?.profileId == profile.id -> AppSessionUiState.Authenticated(profile, session.username)
         else -> AppSessionUiState.Login(profile, bootstrapError)
     }
 }
@@ -123,5 +124,8 @@ sealed interface AppSessionUiState {
         val profile: ProviderProfile,
         val bootstrapError: String? = null,
     ) : AppSessionUiState
-    data class Authenticated(val profile: ProviderProfile) : AppSessionUiState
+    data class Authenticated(
+        val profile: ProviderProfile,
+        val username: Username,
+    ) : AppSessionUiState
 }

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

@@ -0,0 +1,183 @@
+package com.flagship.abox.manager.ui.shell
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ExitToApp
+import androidx.compose.material.icons.filled.CloudDone
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.ModalBottomSheet
+import androidx.compose.material3.SheetState
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.material3.rememberModalBottomSheetState
+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.res.stringResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import com.flagship.abox.manager.R
+import com.flagship.abox.manager.designsystem.ABoxButton
+import com.flagship.abox.manager.designsystem.ABoxUserAvatar
+
+/**
+ * Account and Provider management bottom sheet triggered by clicking the top bar user avatar.
+ * Allows viewing current session info and signing out.
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun AccountProviderBottomSheet(
+    userName: String,
+    providerName: String,
+    onDismissRequest: () -> Unit,
+    onLogout: () -> Unit,
+    actionInProgress: Boolean,
+    errorMessage: String?,
+    modifier: Modifier = Modifier,
+    sheetState: SheetState = rememberModalBottomSheetState(),
+) {
+    ModalBottomSheet(
+        onDismissRequest = onDismissRequest,
+        sheetState = sheetState,
+        modifier = modifier,
+        containerColor = MaterialTheme.colorScheme.surface,
+    ) {
+        Column(
+            modifier = Modifier
+                .fillMaxWidth()
+                .verticalScroll(rememberScrollState())
+                .padding(horizontal = 24.dp)
+                .padding(bottom = 32.dp),
+            horizontalAlignment = Alignment.CenterHorizontally,
+            verticalArrangement = Arrangement.spacedBy(16.dp),
+        ) {
+            // Header with large avatar & user info
+            ABoxUserAvatar(
+                name = userName,
+                onClick = {},
+                size = 56.dp,
+            )
+
+            Column(
+                horizontalAlignment = Alignment.CenterHorizontally,
+                verticalArrangement = Arrangement.spacedBy(4.dp),
+            ) {
+                Text(
+                    text = userName.ifBlank { stringResource(R.string.account_sheet_title) },
+                    style = MaterialTheme.typography.titleLarge.copy(fontWeight = FontWeight.Bold),
+                    color = MaterialTheme.colorScheme.onSurface,
+                )
+                Text(
+                    text = stringResource(R.string.account_sheet_signed_in_as),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+
+            HorizontalDivider(
+                modifier = Modifier.padding(vertical = 4.dp),
+                color = MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.5f),
+            )
+
+            // Provider Info Card
+            Card(
+                modifier = Modifier.fillMaxWidth(),
+                colors = CardDefaults.cardColors(
+                    containerColor = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.5f),
+                ),
+                shape = RoundedCornerShape(16.dp),
+            ) {
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(16.dp),
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.spacedBy(12.dp),
+                ) {
+                    Box(
+                        modifier = Modifier
+                            .size(40.dp)
+                            .clip(CircleShape)
+                            .background(MaterialTheme.colorScheme.primaryContainer),
+                        contentAlignment = Alignment.Center,
+                    ) {
+                        Icon(
+                            imageVector = Icons.Default.CloudDone,
+                            contentDescription = null,
+                            tint = MaterialTheme.colorScheme.onPrimaryContainer,
+                            modifier = Modifier.size(22.dp),
+                        )
+                    }
+
+                    Column(modifier = Modifier.weight(1f)) {
+                        Text(
+                            text = stringResource(R.string.account_sheet_provider),
+                            style = MaterialTheme.typography.labelMedium,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                        Text(
+                            text = providerName,
+                            style = MaterialTheme.typography.bodyLarge.copy(fontWeight = FontWeight.SemiBold),
+                            color = MaterialTheme.colorScheme.onSurface,
+                        )
+                    }
+                }
+            }
+
+            Spacer(modifier = Modifier.height(8.dp))
+
+            // Action button
+            ABoxButton(
+                onClick = onLogout,
+                enabled = !actionInProgress,
+                modifier = Modifier.fillMaxWidth(),
+            ) {
+                Icon(
+                    imageVector = Icons.AutoMirrored.Filled.ExitToApp,
+                    contentDescription = null,
+                    modifier = Modifier.size(20.dp),
+                )
+                Spacer(modifier = Modifier.size(8.dp))
+                Text(stringResource(R.string.account_sheet_logout))
+            }
+
+            errorMessage?.let { error ->
+                Text(
+                    text = error,
+                    color = MaterialTheme.colorScheme.error,
+                    style = MaterialTheme.typography.bodyMedium,
+                )
+            }
+
+            TextButton(
+                onClick = onDismissRequest,
+                enabled = !actionInProgress,
+                modifier = Modifier.fillMaxWidth(),
+            ) {
+                Text(
+                    text = stringResource(R.string.account_sheet_close),
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+        }
+    }
+}

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

@@ -0,0 +1,186 @@
+package com.flagship.abox.manager.ui.shell
+
+import androidx.compose.animation.Crossfade
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.statusBarsPadding
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.saveable.rememberSaveableStateHolder
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import com.flagship.abox.manager.R
+import com.flagship.abox.manager.designsystem.ABoxNavigationBar
+import com.flagship.abox.manager.designsystem.ABoxNavigationBarItem
+import com.flagship.abox.manager.designsystem.ABoxTopPillBar
+
+/**
+ * Main authenticated application shell.
+ *
+ * Provides:
+ * 1. A floating/pinned pill top app bar with provider context, '+' action, and avatar account sheet.
+ * 2. Material 3 bottom navigation bar with pill indicator for Devices, Scenes, and Activity tabs.
+ * 3. Clear composable slot boundaries for team member integrations.
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun MainAppShell(
+    userName: String,
+    providerName: String,
+    onLogout: () -> Unit,
+    modifier: Modifier = Modifier,
+    initialTab: MainTab = MainTab.DEVICES,
+    onTabSelected: (MainTab) -> Unit = {},
+    onAddClick: (() -> Unit)? = null,
+    actionInProgress: Boolean = false,
+    errorMessage: String? = null,
+    devicesSlot: @Composable () -> Unit = { DefaultDevicesSlot() },
+    scenesSlot: @Composable () -> Unit = { DefaultScenesSlot() },
+    activitySlot: @Composable () -> Unit = { DefaultActivitySlot() },
+) {
+    var activeTab by rememberSaveable { mutableStateOf(initialTab) }
+    var showAccountSheet by remember { mutableStateOf(false) }
+    val tabStateHolder = rememberSaveableStateHolder()
+
+    Scaffold(
+        modifier = modifier.fillMaxSize(),
+        topBar = {
+            Box(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .statusBarsPadding()
+                    .padding(horizontal = 16.dp, vertical = 8.dp),
+            ) {
+                ABoxTopPillBar(
+                    title = stringResource(R.string.top_bar_prompt_format, providerName),
+                    userName = userName,
+                    onAvatarClick = { showAccountSheet = true },
+                    onAddClick = onAddClick,
+                    addActionContentDescription = stringResource(R.string.action_add),
+                    avatarContentDescription = stringResource(R.string.action_account),
+                )
+            }
+        },
+        bottomBar = {
+            ABoxNavigationBar {
+                MainTab.values().forEach { tab ->
+                    val isSelected = (tab == activeTab)
+                    ABoxNavigationBarItem(
+                        selected = isSelected,
+                        onClick = {
+                            activeTab = tab
+                            onTabSelected(tab)
+                        },
+                        icon = {
+                            Icon(
+                                imageVector = if (isSelected) tab.selectedIcon else tab.unselectedIcon,
+                                contentDescription = stringResource(tab.labelRes),
+                            )
+                        },
+                        label = {
+                            Text(text = stringResource(tab.labelRes))
+                        },
+                    )
+                }
+            }
+        },
+    ) { innerPadding ->
+        Box(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(innerPadding),
+        ) {
+            Crossfade(
+                targetState = activeTab,
+                label = "MainTabCrossfade",
+            ) { tab ->
+                tabStateHolder.SaveableStateProvider(tab) {
+                    when (tab) {
+                        MainTab.DEVICES -> devicesSlot()
+                        MainTab.SCENES -> scenesSlot()
+                        MainTab.ACTIVITY -> activitySlot()
+                    }
+                }
+            }
+        }
+    }
+
+    if (showAccountSheet) {
+        AccountProviderBottomSheet(
+            userName = userName,
+            providerName = providerName,
+            onDismissRequest = { showAccountSheet = false },
+            onLogout = onLogout,
+            actionInProgress = actionInProgress,
+            errorMessage = errorMessage,
+        )
+    }
+}
+
+@Composable
+private fun DefaultDevicesSlot() {
+    SlotPlaceholder(
+        title = stringResource(R.string.devices_placeholder_title),
+        description = stringResource(R.string.devices_placeholder_description),
+    )
+}
+
+@Composable
+private fun DefaultScenesSlot() {
+    SlotPlaceholder(
+        title = stringResource(R.string.scenes_placeholder_title),
+        description = stringResource(R.string.scenes_placeholder_description),
+    )
+}
+
+@Composable
+private fun DefaultActivitySlot() {
+    SlotPlaceholder(
+        title = stringResource(R.string.activity_placeholder_title),
+        description = stringResource(R.string.activity_placeholder_description),
+    )
+}
+
+@Composable
+private fun SlotPlaceholder(
+    title: String,
+    description: String,
+) {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(24.dp),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center,
+    ) {
+        Text(
+            text = title,
+            style = MaterialTheme.typography.headlineSmall,
+            textAlign = TextAlign.Center,
+            color = MaterialTheme.colorScheme.onSurface,
+        )
+        Text(
+            text = description,
+            style = MaterialTheme.typography.bodyMedium,
+            textAlign = TextAlign.Center,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.padding(top = 8.dp),
+        )
+    }
+}

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

@@ -0,0 +1,41 @@
+package com.flagship.abox.manager.ui.shell
+
+import androidx.annotation.StringRes
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.AutoAwesome
+import androidx.compose.material.icons.filled.Home
+import androidx.compose.material.icons.filled.ViewAgenda
+import androidx.compose.material.icons.outlined.AutoAwesome
+import androidx.compose.material.icons.outlined.Home
+import androidx.compose.material.icons.outlined.ViewAgenda
+import androidx.compose.ui.graphics.vector.ImageVector
+import com.flagship.abox.manager.R
+
+/**
+ * Main bottom navigation tabs for the authenticated application shell.
+ */
+enum class MainTab(
+    @StringRes val labelRes: Int,
+    val selectedIcon: ImageVector,
+    val unselectedIcon: ImageVector,
+    val route: String,
+) {
+    DEVICES(
+        labelRes = R.string.tab_devices,
+        selectedIcon = Icons.Filled.Home,
+        unselectedIcon = Icons.Outlined.Home,
+        route = "shell/devices",
+    ),
+    SCENES(
+        labelRes = R.string.tab_scenes,
+        selectedIcon = Icons.Filled.AutoAwesome,
+        unselectedIcon = Icons.Outlined.AutoAwesome,
+        route = "shell/scenes",
+    ),
+    ACTIVITY(
+        labelRes = R.string.tab_activity,
+        selectedIcon = Icons.Filled.ViewAgenda,
+        unselectedIcon = Icons.Outlined.ViewAgenda,
+        route = "shell/activity",
+    ),
+}

android/app/src/main/res/values-zh-rCN/strings.xml

@@ -8,7 +8,6 @@
     <string name="provider_local_description">无需网络，通过本地模拟设备体验应用。</string>
     <string name="login_title">登录 %1$s</string>
     <string name="login_provider_context">当前提供方：%1$s</string>
-    <string name="login_back_to_providers">返回提供方选择</string>
     <string name="login_username">用户名</string>
     <string name="login_password">密码</string>
     <string name="login_remember_username">记住用户名</string>
@@ -24,4 +23,23 @@
     <string name="action_switch_provider">切换提供方</string>
     <string name="authenticated_title">已连接到 %1$s</string>
     <string name="authenticated_description">登录后入口已经就绪，设备导航将由对应模块负责人接入。</string>
+
+    <!-- 认证后壳层 -->
+    <string name="tab_devices">设备</string>
+    <string name="tab_scenes">情景</string>
+    <string name="tab_activity">活动记录</string>
+    <string name="top_bar_prompt_format">问问“%1$s”&#8230;</string>
+    <string name="action_add">添加</string>
+    <string name="action_account">账户与提供方</string>
+    <string name="account_sheet_title">账户与提供方</string>
+    <string name="account_sheet_signed_in_as">当前登录为</string>
+    <string name="account_sheet_provider">当前提供方</string>
+    <string name="account_sheet_logout">退出登录</string>
+    <string name="account_sheet_close">关闭</string>
+    <string name="devices_placeholder_title">设备列表</string>
+    <string name="devices_placeholder_description">设备列表与控制卡片插槽（由 alZerNest 模块实现）。</string>
+    <string name="scenes_placeholder_title">情景模式</string>
+    <string name="scenes_placeholder_description">情景动作与执行插槽（由 tzh 模块实现）。</string>
+    <string name="activity_placeholder_title">活动记录</string>
+    <string name="activity_placeholder_description">未记录任何事件。</string>
 </resources>

android/app/src/main/res/values/strings.xml

@@ -8,7 +8,6 @@
     <string name="provider_local_description">Explore the app with simulated local devices and no network connection.</string>
     <string name="login_title">Sign in to %1$s</string>
     <string name="login_provider_context">Selected provider: %1$s</string>
-    <string name="login_back_to_providers">Back to providers</string>
     <string name="login_username">Username</string>
     <string name="login_password">Password</string>
     <string name="login_remember_username">Remember username</string>
@@ -24,4 +23,23 @@
     <string name="action_switch_provider">Switch provider</string>
     <string name="authenticated_title">Connected to %1$s</string>
     <string name="authenticated_description">The authenticated route is ready. Device navigation will be added by its module owner.</string>
+
+    <!-- Authenticated shell -->
+    <string name="tab_devices">Devices</string>
+    <string name="tab_scenes">Scenes</string>
+    <string name="tab_activity">Activity</string>
+    <string name="top_bar_prompt_format">Ask "%1$s"&#8230;</string>
+    <string name="action_add">Add</string>
+    <string name="action_account">Account &amp; Provider</string>
+    <string name="account_sheet_title">Account &amp; Provider</string>
+    <string name="account_sheet_signed_in_as">Signed in as</string>
+    <string name="account_sheet_provider">Active Provider</string>
+    <string name="account_sheet_logout">Sign Out</string>
+    <string name="account_sheet_close">Close</string>
+    <string name="devices_placeholder_title">Device List</string>
+    <string name="devices_placeholder_description">Device list and control cards slot for alZerNest.</string>
+    <string name="scenes_placeholder_title">Scene Mode</string>
+    <string name="scenes_placeholder_description">Scene actions and execution slot for tzh.</string>
+    <string name="activity_placeholder_title">Activity Log</string>
+    <string name="activity_placeholder_description">No recorded events yet.</string>
 </resources>

android/app/src/test/kotlin/com/flagship/abox/manager/ui/session/AppSessionViewModelTest.kt

@@ -21,6 +21,7 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.test.UnconfinedTestDispatcher
 import kotlinx.coroutines.test.advanceUntilIdle
 import kotlinx.coroutines.test.runTest
+import org.junit.Assert.assertEquals
 import org.junit.Assert.assertTrue
 import org.junit.Rule
 import org.junit.Test
@@ -117,6 +118,8 @@ class AppSessionViewModelTest {
 
         val state = viewModel.uiState.value
         assertTrue(state is AppSessionUiState.Authenticated)
+        val authenticated = state as AppSessionUiState.Authenticated
+        assertEquals(credentials.username, authenticated.username)
     }
 
     private companion object {

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

@@ -0,0 +1,28 @@
+package com.flagship.abox.manager.ui.shell
+
+import com.flagship.abox.manager.R
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNotNull
+import org.junit.Test
+
+class MainTabTest {
+
+    @Test
+    fun `all main tabs have distinct non-empty routes and valid label resources`() {
+        val tabs = MainTab.values()
+        assertEquals(3, tabs.size)
+
+        val routes = tabs.map { it.route }
+        assertEquals(routes.distinct().size, tabs.size)
+
+        tabs.forEach { tab ->
+            assertNotNull(tab.selectedIcon)
+            assertNotNull(tab.unselectedIcon)
+            assert(tab.route.isNotBlank())
+        }
+
+        assertEquals(R.string.tab_devices, MainTab.DEVICES.labelRes)
+        assertEquals(R.string.tab_scenes, MainTab.SCENES.labelRes)
+        assertEquals(R.string.tab_activity, MainTab.ACTIVITY.labelRes)
+    }
+}

android/core/designsystem/build.gradle.kts

@@ -34,5 +34,6 @@ dependencies {
     implementation(libs.compose.ui)
     implementation(libs.compose.ui.tooling.preview)
     implementation(libs.compose.material3)
+    implementation(libs.compose.material.icons.extended)
     debugImplementation(libs.compose.ui.tooling)
 }

android/core/designsystem/src/main/kotlin/com/flagship/abox/manager/designsystem/Components.kt

@@ -1,12 +1,43 @@
 package com.flagship.abox.manager.designsystem
 
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.RowScope
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.LocationOn
+import androidx.compose.material.icons.filled.Person
 import androidx.compose.material3.Button
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.NavigationBar
+import androidx.compose.material3.NavigationBarItem
+import androidx.compose.material3.NavigationBarItemDefaults
 import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
 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.graphics.Color
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
 
 @Composable
 fun ABoxSurface(
@@ -36,3 +67,162 @@ fun ABoxButton(
 fun ABoxLoadingIndicator(modifier: Modifier = Modifier) {
     CircularProgressIndicator(modifier = modifier)
 }
+
+/**
+ * Circular user avatar displaying the initial character of username or a default person icon.
+ * Styled with an accented profile ring.
+ */
+@Composable
+fun ABoxUserAvatar(
+    name: String?,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+    size: Dp = 36.dp,
+    contentDescription: String? = null,
+) {
+    val initial = name?.trim()?.takeIf { it.isNotEmpty() }?.take(1)?.uppercase()
+    Box(
+        modifier = modifier
+            .size(size)
+            .clip(CircleShape)
+            .background(MaterialTheme.colorScheme.primaryContainer)
+            .border(
+                width = 2.dp,
+                color = MaterialTheme.colorScheme.primary.copy(alpha = 0.8f),
+                shape = CircleShape,
+            )
+            .clickable(onClickLabel = contentDescription, onClick = onClick),
+        contentAlignment = Alignment.Center,
+    ) {
+        if (initial != null) {
+            Text(
+                text = initial,
+                style = MaterialTheme.typography.titleMedium.copy(
+                    fontWeight = FontWeight.Bold,
+                    color = MaterialTheme.colorScheme.onPrimaryContainer,
+                ),
+            )
+        } else {
+            Icon(
+                imageVector = Icons.Default.Person,
+                contentDescription = contentDescription,
+                tint = MaterialTheme.colorScheme.onPrimaryContainer,
+                modifier = Modifier.size(size * 0.6f),
+            )
+        }
+    }
+}
+
+/**
+ * Material 3 pill top bar containing leading icon, title/provider label,
+ * an optional '+' action button, and user avatar.
+ */
+@Composable
+fun ABoxTopPillBar(
+    title: String,
+    onAvatarClick: () -> Unit,
+    modifier: Modifier = Modifier,
+    userName: String? = null,
+    leadingIcon: ImageVector = Icons.Default.LocationOn,
+    onAddClick: (() -> Unit)? = null,
+    addActionContentDescription: String? = "Add",
+    avatarContentDescription: String? = "Account",
+) {
+    Surface(
+        modifier = modifier
+            .fillMaxWidth()
+            .height(56.dp),
+        shape = RoundedCornerShape(28.dp),
+        color = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.6f),
+        tonalElevation = 2.dp,
+    ) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(horizontal = 12.dp),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(8.dp),
+        ) {
+            Icon(
+                imageVector = leadingIcon,
+                contentDescription = null,
+                tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.size(22.dp),
+            )
+
+            Text(
+                text = title,
+                style = MaterialTheme.typography.titleMedium.copy(fontWeight = FontWeight.SemiBold),
+                color = MaterialTheme.colorScheme.onSurface,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+                modifier = Modifier.weight(1f),
+            )
+
+            if (onAddClick != null) {
+                IconButton(
+                    onClick = onAddClick,
+                    modifier = Modifier.size(36.dp),
+                ) {
+                    Icon(
+                        imageVector = Icons.Default.Add,
+                        contentDescription = addActionContentDescription,
+                        tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                    )
+                }
+            }
+
+            ABoxUserAvatar(
+                name = userName,
+                onClick = onAvatarClick,
+                size = 36.dp,
+                contentDescription = avatarContentDescription,
+            )
+        }
+    }
+}
+
+/**
+ * ABox standard Material 3 Navigation Bar with pill indicator styling.
+ */
+@Composable
+fun ABoxNavigationBar(
+    modifier: Modifier = Modifier,
+    containerColor: Color = MaterialTheme.colorScheme.surface,
+    content: @Composable RowScope.() -> Unit,
+) {
+    NavigationBar(
+        modifier = modifier,
+        containerColor = containerColor,
+        content = content,
+    )
+}
+
+/**
+ * ABox standard Navigation Bar Item.
+ */
+@Composable
+fun RowScope.ABoxNavigationBarItem(
+    selected: Boolean,
+    onClick: () -> Unit,
+    icon: @Composable () -> Unit,
+    label: @Composable (() -> Unit)? = null,
+    modifier: Modifier = Modifier,
+    enabled: Boolean = true,
+) {
+    NavigationBarItem(
+        selected = selected,
+        onClick = onClick,
+        icon = icon,
+        label = label,
+        modifier = modifier,
+        enabled = enabled,
+        colors = NavigationBarItemDefaults.colors(
+            indicatorColor = MaterialTheme.colorScheme.secondaryContainer,
+            selectedIconColor = MaterialTheme.colorScheme.onSecondaryContainer,
+            unselectedIconColor = MaterialTheme.colorScheme.onSurfaceVariant,
+            selectedTextColor = MaterialTheme.colorScheme.onSurface,
+            unselectedTextColor = MaterialTheme.colorScheme.onSurfaceVariant,
+        ),
+    )
+}

gradle/libs.versions.toml

@@ -26,6 +26,7 @@ compose-ui = { module = "androidx.compose.ui:ui" }
 compose-ui-tooling = { module = "androidx.compose.ui:ui-tooling" }
 compose-ui-tooling-preview = { module = "androidx.compose.ui:ui-tooling-preview" }
 compose-material3 = { module = "androidx.compose.material3:material3" }
+compose-material-icons-extended = { module = "androidx.compose.material:material-icons-extended" }
 compose-ui-test-junit4 = { module = "androidx.compose.ui:ui-test-junit4" }
 compose-ui-test-manifest = { module = "androidx.compose.ui:ui-test-manifest" }
 kotlinx-coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "coroutines" }