fix(mobile): align iOS and Android with HarmonyOS interaction behavior

src/apps/mobile/android/app/src/androidTest/kotlin/com/openbitfun/mobile/app/ChatMessageBubbleTest.kt

@@ -139,6 +139,22 @@ class ChatMessageBubbleTest {
         assertTrue(composeRule.onAllNodesWithText("Build step finished.").fetchSemanticsNodes().isEmpty())
     }
 
+
+    @Test
+    fun anOpenSubagentReceivesNewStepsWithoutClosing() {
+        var block by mutableStateOf(MessageBlock.Subagent("live-owner", "Live task", true, "",
+            listOf(MessageBlock.Text("first", "First step", false))))
+        composeRule.setContent { Bubble(row(kind = ConversationRowKind.ASSISTANT, blocks = listOf(block))) }
+        composeRule.onNodeWithText("Live task").performClick()
+        composeRule.runOnIdle {
+            block = block.copy(children = block.children + MessageBlock.Text("second", "Later step", false))
+        }
+        composeRule.onNodeWithText("Later step").assertIsDisplayed()
+        composeRule.runOnIdle { block = block.copy(running = false, status = "completed") }
+        composeRule.onNodeWithText("First step").assertIsDisplayed()
+        composeRule.onNodeWithText("Later step").assertIsDisplayed()
+    }
+
     @Test
     fun aRunningSubagentPreservesUserCollapseAcrossStreamUpdates() {
         var block by mutableStateOf(

src/apps/mobile/android/app/src/androidTest/kotlin/com/openbitfun/mobile/app/ComposerModelSelectorTest.kt

@@ -1,5 +1,8 @@
 package com.openbitfun.mobile.app
 
+import android.graphics.Bitmap
+import androidx.test.platform.app.InstrumentationRegistry
+import java.io.File
 import androidx.compose.ui.test.assertIsDisplayed
 import androidx.compose.ui.test.junit4.v2.createComposeRule
 import androidx.compose.ui.test.onNodeWithTag
@@ -13,6 +16,7 @@ import com.openbitfun.mobile.app.ui.theme.OpenBitFunTheme
 import com.openbitfun.mobile.core.feature.connection.ConnectionPhase
 import com.openbitfun.mobile.core.feature.session.ChatComposerCapabilities
 import com.openbitfun.mobile.core.feature.session.ModelOption
+import com.openbitfun.mobile.core.feature.session.ModelRole
 import org.junit.Assert.assertEquals
 import org.junit.Rule
 import org.junit.Test
@@ -21,12 +25,42 @@ class ComposerModelSelectorTest {
     @get:Rule
     val composeRule = createComposeRule()
 
+    private fun capture(name: String) {
+        composeRule.waitForIdle()
+        val instrumentation = InstrumentationRegistry.getInstrumentation()
+        val bitmap = instrumentation.uiAutomation.takeScreenshot()
+        File(instrumentation.targetContext.getExternalFilesDir(null), name).outputStream().use {
+            bitmap.compress(Bitmap.CompressFormat.PNG, 100, it)
+        }
+        bitmap.recycle()
+    }
+
+    @Test
+    fun collapsedDraftHasNoSupplementalMicrophone() {
+        composeRule.setContent {
+            OpenBitFunTheme(dark = false) {
+                ComposerBar(draft = "A long draft that must keep its room in the collapsed input".repeat(4),
+                    images = emptyList(), busy = false, streaming = false, phase = ConnectionPhase.CONNECTED,
+                    model = null, capabilities = ChatComposerCapabilities.RemoteChat, placeholder = "Message",
+                    onDraftChange = {}, onRemoveImage = {}, onAttach = {}, onVoice = {}, onSend = {},
+                    onStop = {}, onOpenModels = {}, modifier = androidx.compose.ui.Modifier)
+            }
+        }
+        composeRule.onNodeWithTag("composer-voice").assertDoesNotExist()
+        composeRule.onNodeWithTag(COMPOSER_INPUT_TEST_TAG).assertIsDisplayed()
+        capture("parity-collapsed-draft.png")
+        composeRule.onNodeWithTag(COMPOSER_INPUT_TEST_TAG).performClick()
+        composeRule.onNodeWithTag("composer-voice").assertIsDisplayed()
+    }
+
     @Test
     fun theExpandedComposerSelectsAConfiguredModel() {
         var selected = "account-primary"
         val models = listOf(
-            ModelOption("account-primary", "Primary", "Account model", true),
-            ModelOption("account-fast", "Fast", "Account model", false),
+            ModelOption("primary", "Primary", "Account model", false, ModelRole.PRIMARY, emptyList(), false),
+            ModelOption("fast", "Fast", "Account model", false, ModelRole.FAST, emptyList(), true),
+            ModelOption("account-primary", "Primary", "Account model", true, null, listOf(ModelRole.PRIMARY), false),
+            ModelOption("account-fast", "Fast", "Account model", false, null, listOf(ModelRole.FAST), false),
         )
         composeRule.setContent {
             OpenBitFunTheme(dark = false) {
@@ -56,9 +90,11 @@ class ComposerModelSelectorTest {
         composeRule.onNodeWithTag(COMPOSER_INPUT_TEST_TAG).performClick()
         composeRule.onNodeWithTag(MODEL_CONTROL_TEST_TAG).assertIsDisplayed().performClick()
         composeRule.onNodeWithTag(MODEL_SELECTOR_TEST_TAG).assertIsDisplayed()
-        composeRule.onNodeWithTag(MODEL_SELECTOR_OPTION_TEST_TAG_PREFIX + "account-fast")
-            .performClick()
+        composeRule.onNodeWithTag(MODEL_SELECTOR_OPTION_TEST_TAG_PREFIX + "primary").assertIsDisplayed()
+        composeRule.onNodeWithTag(MODEL_SELECTOR_OPTION_TEST_TAG_PREFIX + "fast").assertIsDisplayed()
+        capture("parity-model-roles.png")
+        composeRule.onNodeWithTag(MODEL_SELECTOR_OPTION_TEST_TAG_PREFIX + "fast").performClick()
 
-        assertEquals("account-fast", selected)
+        assertEquals("fast", selected)
     }
 }

src/apps/mobile/android/app/src/main/kotlin/com/openbitfun/mobile/app/ui/chat/ComposerBar.kt

@@ -33,6 +33,7 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.Icon
+import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
@@ -59,6 +60,7 @@ import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.Role
+import androidx.compose.ui.semantics.clearAndSetSemantics
 import androidx.compose.ui.semantics.contentDescription
 import androidx.compose.ui.semantics.role
 import androidx.compose.ui.semantics.selected
@@ -80,6 +82,7 @@ import com.openbitfun.mobile.core.feature.session.ChatComposerPolicy
 import com.openbitfun.mobile.core.feature.session.ComposerImage
 import com.openbitfun.mobile.core.feature.session.ComposerPrimaryAction
 import com.openbitfun.mobile.core.feature.session.ModelOption
+import com.openbitfun.mobile.core.feature.session.ModelRole
 
 internal const val COMPOSER_TEST_TAG: String = "composer"
 internal const val COMPOSER_INPUT_TEST_TAG: String = "composer-input"
@@ -287,9 +290,6 @@ internal fun ComposerBar(
                         enter = compactControlEnter,
                         exit = compactControlExit,
                     ) {
-                        if (capabilities.showVoiceInput && !busy && (draft.isNotBlank() || images.isNotEmpty())) {
-                            PrimaryActionButton(action = ComposerPrimaryAction.VOICE, onVoice = onVoice, onSend = onSend, onStop = onStop, testTag = "composer-voice")
-                        }
                         PrimaryActionButton(
                             action = action,
                             stopEnabled = ChatComposerPolicy.canStop(streaming, capabilities.requiresRemoteConnection, phase),
@@ -338,8 +338,8 @@ internal fun ComposerBar(
                             )
                         }
                         Box(modifier = Modifier.weight(1f))
-                        if (capabilities.showVoiceInput && !busy && (draft.isNotBlank() || images.isNotEmpty())) {
-                            PrimaryActionButton(action = ComposerPrimaryAction.VOICE, onVoice = onVoice, onSend = onSend, onStop = onStop, testTag = "composer-voice")
+                        if (capabilities.showVoiceInput && (draft.isNotBlank() || images.isNotEmpty())) {
+                            PrimaryActionButton(action = if (busy) ComposerPrimaryAction.VOICE_BLOCKED else ComposerPrimaryAction.VOICE, onVoice = onVoice, onSend = onSend, onStop = onStop, testTag = "composer-voice")
                         }
                         PrimaryActionButton(
                             action = action,
@@ -402,7 +402,17 @@ private fun ComposerField(
                         color = colors.onSurfaceVariant,
                     )
                 }
-                field()
+                // Focus expands the same editor. At rest, render a one-line
+                // preview so overflow cannot scroll sideways or lose the draft.
+                Box(Modifier.alpha(if (!expanded && draft.isNotEmpty()) 0f else 1f)) { field() }
+                if (!expanded && draft.isNotEmpty()) Text(
+                    draft,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                    style = MaterialTheme.typography.bodyLarge,
+                    color = colors.onSurface,
+                    modifier = Modifier.fillMaxWidth().clearAndSetSemantics {},
+                )
             }
         },
     )
@@ -446,7 +456,7 @@ private fun ModelControl(
 ) {
     val label = stringResource(R.string.models_title)
     val displayModel = model ?: modelOptions.firstOrNull { it.selected }
-    val displayLabel = displayModel?.primaryLabel ?: label
+    val displayLabel = displayModel?.let { modelOptionTitle(it) } ?: label
     val wide = composerIsWide(LocalConfiguration.current.screenWidthDp)
     Box {
         Row(
@@ -530,7 +540,9 @@ private fun ModelSelectorContent(
     onDismiss: () -> Unit,
 ) {
     val selectorOptions = remember(options) {
-        options.filter(ModelOption::selected) + options.filterNot(ModelOption::selected)
+        options.filter { it.role != null } +
+            options.filter { it.role == null && it.selected } +
+            options.filter { it.role == null && !it.selected }
     }
     val visibleRows = selectorOptions.size.coerceAtMost(7)
     val listHeight = if (visibleRows == 0) {
@@ -597,7 +609,12 @@ private fun ModelSelectorContent(
                     .height(listHeight)
                     .verticalScroll(rememberScrollState()),
             ) {
-                selectorOptions.forEach { option ->
+                selectorOptions.forEachIndexed { index, option ->
+                    if (index > 0 && option.role == null && selectorOptions[index - 1].role != null) {
+                        HorizontalDivider(color = MaterialTheme.colorScheme.outlineVariant)
+                    }
+                    val title = modelOptionTitle(option)
+                    val subtitle = modelOptionSubtitle(option)
                     Row(
                         verticalAlignment = Alignment.CenterVertically,
                         horizontalArrangement = Arrangement.spacedBy(10.dp),
@@ -616,7 +633,7 @@ private fun ModelSelectorContent(
                             .clickable { onSelect(option.id) }
                             .semantics {
                                 contentDescription =
-                                    "${option.primaryLabel} · ${option.secondaryLabel}"
+                                    "$title · $subtitle"
                                 role = Role.Button
                                 selected = option.selected
                             }
@@ -641,24 +658,44 @@ private fun ModelSelectorContent(
                             modifier = Modifier.weight(1f),
                         ) {
                             Text(
-                                option.primaryLabel,
+                                title,
                                 fontSize = MaterialTheme.typography.labelLarge.fontSize,
                                 fontWeight = FontWeight.Medium,
                                 color = MaterialTheme.colorScheme.onSurface,
                             )
                             Text(
-                                option.secondaryLabel,
+                                subtitle,
                                 fontSize = MaterialTheme.typography.bodySmall.fontSize,
                                 color = MaterialTheme.colorScheme.onSurfaceVariant,
                             )
                         }
+                        option.roles.forEach { role ->
+                            Text(
+                                stringResource(if (role == ModelRole.PRIMARY) R.string.model_role_primary else R.string.model_role_fast),
+                                style = MaterialTheme.typography.labelSmall,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                                modifier = Modifier.background(MaterialTheme.colorScheme.surfaceVariant, RoundedCornerShape(4.dp))
+                                    .padding(horizontal = 6.dp, vertical = 1.dp),
+                            )
+                        }
                     }
                 }
             }
         }
     }
 }
 
+@Composable
+internal fun modelOptionTitle(option: ModelOption): String = when (option.role) {
+    ModelRole.PRIMARY -> stringResource(R.string.model_primary)
+    ModelRole.FAST -> stringResource(R.string.model_fast)
+    null -> option.primaryLabel
+}
+
+@Composable
+internal fun modelOptionSubtitle(option: ModelOption): String =
+    if (option.fallsBackToPrimary) stringResource(R.string.model_fast_fallback) else option.secondaryLabel
+
 /** What a control that is offered but not usable right now looks like. */
 private const val DimmedAlpha: Float = 0.38f
 

src/apps/mobile/android/app/src/main/kotlin/com/openbitfun/mobile/app/ui/chat/ConversationView.kt

@@ -9,6 +9,9 @@ import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.navigationBars
+import androidx.compose.foundation.layout.ime
 import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.size
 import androidx.compose.material3.Button
@@ -268,6 +271,11 @@ internal fun ConversationView(
         var topInset by remember { mutableStateOf(0.dp) }
         var bottomInset by remember { mutableStateOf(0.dp) }
         val density = LocalDensity.current
+        // Scaffold already lifts the pane above the keyboard. Navigation only
+        // belongs to this layer when the keyboard is absent.
+        val navigationBottom = with(density) {
+            if (WindowInsets.ime.getBottom(this) > 0) 0.dp else WindowInsets.navigationBars.getBottom(this).toDp()
+        }
         Box(modifier = Modifier.fillMaxSize().testTag(CONVERSATION_TEST_TAG)) {
             if (timeline == null) {
                 Box(Modifier.fillMaxSize()) {
@@ -338,7 +346,8 @@ internal fun ConversationView(
                     // short of that leaves a line of text sitting crisp and
                     // legible beside the pill after it has already faded out
                     // higher up.
-                    .background(bottomOverlayFade()),
+                    .background(bottomOverlayFade())
+                    .padding(bottom = navigationBottom),
             ) {
                 if (attachmentDraft.failed.value) {
                     TextButton(onClick = { attachmentDraft.retry() }) {

src/apps/mobile/android/app/src/main/kotlin/com/openbitfun/mobile/app/ui/settings/RemoteSettingsSheet.kt

@@ -119,8 +119,8 @@ private fun ModelSection(
                     options.forEachIndexed { index, option ->
                         if (index > 0) HorizontalDivider()
                         SelectableRow(
-                            label = option.primaryLabel,
-                            description = option.secondaryLabel,
+                            label = com.openbitfun.mobile.app.ui.chat.modelOptionTitle(option),
+                            description = com.openbitfun.mobile.app.ui.chat.modelOptionSubtitle(option),
                             selected = option.selected,
                             enabled = !state.busy && sessionId.isNotEmpty(),
                             onSelect = {

src/apps/mobile/android/app/src/main/kotlin/com/openbitfun/mobile/app/ui/shell/MobileScreen.kt

@@ -17,6 +17,9 @@ import androidx.compose.foundation.layout.imePadding
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.safeDrawingPadding
 import androidx.compose.foundation.layout.union
+import androidx.compose.foundation.layout.only
+import androidx.compose.foundation.layout.WindowInsetsSides
+import androidx.compose.foundation.layout.consumeWindowInsets
 import androidx.compose.foundation.layout.width
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.MaterialTheme
@@ -440,13 +443,17 @@ internal fun MobileScreen(onAccountRestored: (Boolean) -> Unit = {}) {
             // keeps the input bar above the keyboard. `union` rather than a
             // second padding: the IME inset already contains the navigation
             // bar's, and adding them would leave a gap the height of the bar.
-            contentWindowInsets = ScaffoldDefaults.contentWindowInsets.union(WindowInsets.ime),
+            contentWindowInsets = (if (shell.surface == MobileSurface.REMOTE && routedSessionId != null) {
+                // The conversation owns the bottom strip: its viewport reaches
+                // the screen edge while the fixed composer clears navigation.
+                ScaffoldDefaults.contentWindowInsets.only(WindowInsetsSides.Top + WindowInsetsSides.Horizontal)
+            } else ScaffoldDefaults.contentWindowInsets).union(WindowInsets.ime),
             // HarmonyOS hides the platform title bar. Each product surface owns
             // its 44dp controls and title row, so a Material TopAppBar here would
             // add a second header above every conversation and remote page.
             topBar = {},
         ) { insets ->
-            Box(Modifier.padding(insets)) {
+            Box(Modifier.padding(insets).consumeWindowInsets(insets)) {
                 when (shell.surface) {
                     MobileSurface.REMOTE -> when (controlSummary.source) {
                         RemoteControlSource.ACCOUNT_DEVICE -> AccountRemoteScreen(

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

@@ -479,4 +479,9 @@
     <string name="chat_loading_older_messages">正在加载更早消息…</string>
     <string name="tool_todo_fallback">任务列表</string>
     <string name="tool_todo_all_completed">全部任务已完成</string>
+    <string name="model_primary">主力模型</string>
+    <string name="model_fast">快速模型</string>
+    <string name="model_fast_fallback">未配置快速模型，使用主力模型</string>
+    <string name="model_role_primary">主力</string>
+    <string name="model_role_fast">快速</string>
 </resources>

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

@@ -494,4 +494,9 @@
     <string name="chat_loading_older_messages">Loading earlier messages…</string>
     <string name="tool_todo_fallback">Task list</string>
     <string name="tool_todo_all_completed">All tasks completed</string>
+    <string name="model_primary">Primary model</string>
+    <string name="model_fast">Fast model</string>
+    <string name="model_fast_fallback">Fast model not configured; using primary</string>
+    <string name="model_role_primary">Primary</string>
+    <string name="model_role_fast">Fast</string>
 </resources>