feat: add assistant overlay with Gemini-style pill bar UI

Implement ASSIST intent-based voice assistant that runs as a system
overlay. Launches via home button long-press, shows a compact pill bar
at screen bottom with waveform animation, camera toggle, and expandable
response text. Each session creates a fresh WebSocket connection
(client_type="assistant") with no DB persistence.

New files:
- AssistantConnection interface + AssistantConnectionImpl (clean arch)
- AssistantManager (voice loop with direct WS communication)
- AssistantPillBar (Gemini-style Compose UI)
- AssistantService (LifecycleService with overlay)
- AssistantActivity (transparent, permission checks)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

android/app/src/main/AndroidManifest.xml

@@ -5,6 +5,9 @@
     <uses-permission android:name="android.permission.CAMERA" />
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE" />
 
     <queries>
         <intent>
@@ -47,6 +50,27 @@
                 <action android:name="io.picoclaw.android.AGENT_MESSAGE" />
             </intent-filter>
         </receiver>
+
+        <activity
+            android:name=".assistant.AssistantActivity"
+            android:exported="true"
+            android:excludeFromRecents="true"
+            android:launchMode="singleTask"
+            android:theme="@android:style/Theme.NoDisplay">
+            <intent-filter>
+                <action android:name="android.intent.action.ASSIST" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+
+        <service
+            android:name=".assistant.AssistantService"
+            android:exported="false"
+            android:foregroundServiceType="specialUse">
+            <property
+                android:name="android.app.PROPERTY_SPECIAL_USE_FGS_SUBTYPE"
+                android:value="AI voice assistant overlay for real-time conversation" />
+        </service>
     </application>
 
 </manifest>

android/app/src/main/java/io/picoclaw/android/assistant/AssistantActivity.kt

@@ -0,0 +1,65 @@
+package io.picoclaw.android.assistant
+
+import android.Manifest
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.net.Uri
+import android.os.Bundle
+import android.provider.Settings
+import androidx.activity.ComponentActivity
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.core.content.ContextCompat
+
+class AssistantActivity : ComponentActivity() {
+
+    private val audioPermissionLauncher = registerForActivityResult(
+        ActivityResultContracts.RequestPermission()
+    ) { granted ->
+        if (granted) {
+            launchServiceAndFinish()
+        } else {
+            finish()
+        }
+    }
+
+    private val overlayPermissionLauncher = registerForActivityResult(
+        ActivityResultContracts.StartActivityForResult()
+    ) {
+        if (Settings.canDrawOverlays(this)) {
+            checkAudioPermission()
+        } else {
+            finish()
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        if (!Settings.canDrawOverlays(this)) {
+            val intent = Intent(
+                Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
+                Uri.parse("package:$packageName")
+            )
+            overlayPermissionLauncher.launch(intent)
+            return
+        }
+
+        checkAudioPermission()
+    }
+
+    private fun checkAudioPermission() {
+        if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO)
+            != PackageManager.PERMISSION_GRANTED
+        ) {
+            audioPermissionLauncher.launch(Manifest.permission.RECORD_AUDIO)
+        } else {
+            launchServiceAndFinish()
+        }
+    }
+
+    private fun launchServiceAndFinish() {
+        val serviceIntent = Intent(this, AssistantService::class.java)
+        startForegroundService(serviceIntent)
+        finish()
+    }
+}

android/app/src/main/java/io/picoclaw/android/assistant/AssistantService.kt

@@ -0,0 +1,168 @@
+package io.picoclaw.android.assistant
+
+import android.app.Notification
+import android.content.Intent
+import android.graphics.PixelFormat
+import android.os.IBinder
+import android.view.Gravity
+import android.view.WindowManager
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.platform.ComposeView
+import androidx.core.app.NotificationCompat
+import androidx.lifecycle.LifecycleService
+import androidx.lifecycle.setViewTreeLifecycleOwner
+import androidx.savedstate.SavedStateRegistry
+import androidx.savedstate.SavedStateRegistryController
+import androidx.savedstate.SavedStateRegistryOwner
+import androidx.savedstate.setViewTreeSavedStateRegistryOwner
+import io.ktor.client.HttpClient
+import io.picoclaw.android.core.data.remote.WebSocketClient
+import io.picoclaw.android.core.data.repository.AssistantConnectionImpl
+import io.picoclaw.android.core.domain.repository.AssistantConnection
+import io.picoclaw.android.core.domain.repository.TtsSettingsRepository
+import io.picoclaw.android.core.ui.theme.PicoClawTheme
+import io.picoclaw.android.feature.chat.assistant.AssistantManager
+import io.picoclaw.android.feature.chat.assistant.AssistantPillBar
+import io.picoclaw.android.feature.chat.voice.CameraCaptureManager
+import io.picoclaw.android.feature.chat.voice.SpeechRecognizerWrapper
+import io.picoclaw.android.feature.chat.voice.TextToSpeechWrapper
+import io.picoclaw.android.receiver.NotificationHelper
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import org.koin.android.ext.android.inject
+
+class AssistantService : LifecycleService(), SavedStateRegistryOwner {
+
+    private val httpClient: HttpClient by inject()
+    private val ttsSettingsRepo: TtsSettingsRepository by inject()
+
+    private lateinit var serviceScope: CoroutineScope
+    private lateinit var connection: AssistantConnection
+    private lateinit var assistantManager: AssistantManager
+    private lateinit var ttsWrapper: TextToSpeechWrapper
+    private lateinit var sttWrapper: SpeechRecognizerWrapper
+    private lateinit var cameraCaptureManager: CameraCaptureManager
+
+    private var overlayView: ComposeView? = null
+    private val windowManager by lazy { getSystemService(WINDOW_SERVICE) as WindowManager }
+
+    private val savedStateRegistryController = SavedStateRegistryController.create(this)
+    override val savedStateRegistry: SavedStateRegistry
+        get() = savedStateRegistryController.savedStateRegistry
+
+    override fun onCreate() {
+        savedStateRegistryController.performAttach()
+        savedStateRegistryController.performRestore(null)
+        super.onCreate()
+
+        serviceScope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
+
+        connection = AssistantConnectionImpl(httpClient)
+
+        sttWrapper = SpeechRecognizerWrapper(this)
+        ttsWrapper = TextToSpeechWrapper(this, ttsSettingsRepo.ttsConfig)
+        cameraCaptureManager = CameraCaptureManager(this)
+
+        assistantManager = AssistantManager(
+            sttWrapper = sttWrapper,
+            ttsWrapper = ttsWrapper,
+            connection = connection,
+            cameraCaptureManager = cameraCaptureManager,
+            contentResolver = contentResolver
+        )
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        super.onStartCommand(intent, flags, startId)
+
+        startForeground(NOTIFICATION_ID, buildNotification())
+
+        // Resolve wsUrl from the main WebSocketClient
+        val mainWsClient: WebSocketClient by inject()
+        connection.connect(mainWsClient.wsUrl)
+
+        addOverlay()
+        assistantManager.start(serviceScope)
+
+        return START_NOT_STICKY
+    }
+
+    override fun onDestroy() {
+        removeOverlay()
+        assistantManager.destroy()
+        ttsWrapper.destroy()
+        connection.disconnect()
+        serviceScope.cancel()
+        super.onDestroy()
+    }
+
+    override fun onBind(intent: Intent): IBinder? {
+        super.onBind(intent)
+        return null
+    }
+
+    private fun shutdown() {
+        stopForeground(STOP_FOREGROUND_REMOVE)
+        stopSelf()
+    }
+
+    private fun addOverlay() {
+        if (overlayView != null) return
+
+        val params = WindowManager.LayoutParams(
+            WindowManager.LayoutParams.MATCH_PARENT,
+            WindowManager.LayoutParams.WRAP_CONTENT,
+            WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
+            WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL or
+                WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN,
+            PixelFormat.TRANSLUCENT
+        ).apply {
+            gravity = Gravity.BOTTOM
+        }
+
+        val view = ComposeView(this).apply {
+            setViewTreeLifecycleOwner(this@AssistantService)
+            setViewTreeSavedStateRegistryOwner(this@AssistantService)
+
+            setContent {
+                PicoClawTheme {
+                    val state by assistantManager.state.collectAsState()
+                    AssistantPillBar(
+                        state = state,
+                        onClose = { shutdown() },
+                        onInterrupt = { assistantManager.interrupt() },
+                        onCameraToggle = { assistantManager.toggleCamera() },
+                        cameraCaptureManager = cameraCaptureManager
+                    )
+                }
+            }
+        }
+
+        windowManager.addView(view, params)
+        overlayView = view
+    }
+
+    private fun removeOverlay() {
+        overlayView?.let {
+            windowManager.removeView(it)
+            overlayView = null
+        }
+    }
+
+    private fun buildNotification(): Notification {
+        return NotificationCompat.Builder(this, NotificationHelper.ASSISTANT_CHANNEL_ID)
+            .setSmallIcon(android.R.drawable.ic_btn_speak_now)
+            .setContentTitle("PicoClaw Assistant")
+            .setContentText("Listening...")
+            .setPriority(NotificationCompat.PRIORITY_LOW)
+            .setOngoing(true)
+            .build()
+    }
+
+    companion object {
+        private const val NOTIFICATION_ID = 2001
+    }
+}

android/app/src/main/java/io/picoclaw/android/receiver/NotificationHelper.kt

@@ -12,16 +12,30 @@ object NotificationHelper {
     private const val CHANNEL_NAME = "Agent Messages"
     private const val NOTIFICATION_ID = 1001
 
+    const val ASSISTANT_CHANNEL_ID = "picoclaw_assistant"
+    private const val ASSISTANT_CHANNEL_NAME = "Assistant"
+
     fun createNotificationChannel(context: Context) {
-        val channel = NotificationChannel(
+        val manager = context.getSystemService(NotificationManager::class.java)
+
+        val messageChannel = NotificationChannel(
             CHANNEL_ID,
             CHANNEL_NAME,
             NotificationManager.IMPORTANCE_DEFAULT
         ).apply {
             description = "Messages from PicoClaw agent"
         }
-        val manager = context.getSystemService(NotificationManager::class.java)
-        manager.createNotificationChannel(channel)
+        manager.createNotificationChannel(messageChannel)
+
+        val assistantChannel = NotificationChannel(
+            ASSISTANT_CHANNEL_ID,
+            ASSISTANT_CHANNEL_NAME,
+            NotificationManager.IMPORTANCE_LOW
+        ).apply {
+            description = "Assistant overlay service"
+            setShowBadge(false)
+        }
+        manager.createNotificationChannel(assistantChannel)
     }
 
     fun showMessageNotification(context: Context, content: String) {

android/core/data/src/main/java/io/picoclaw/android/core/data/remote/WebSocketClient.kt

@@ -26,7 +26,8 @@ import kotlinx.serialization.json.Json
 class WebSocketClient(
     private val client: HttpClient,
     private val scope: CoroutineScope,
-    private val clientId: String
+    private val clientId: String,
+    private val clientType: String = "main"
 ) {
 
     private val _connectionState = MutableStateFlow(ConnectionState.DISCONNECTED)
@@ -48,7 +49,7 @@ class WebSocketClient(
             while (isActive) {
                 try {
                     _connectionState.value = ConnectionState.CONNECTING
-                    val url = "$wsUrl?client_id=$clientId&client_type=main"
+                    val url = "$wsUrl?client_id=$clientId&client_type=$clientType"
                     client.webSocket(url) {
                         session = this
                         _connectionState.value = ConnectionState.CONNECTED

android/core/data/src/main/java/io/picoclaw/android/core/data/repository/AssistantConnectionImpl.kt

@@ -0,0 +1,71 @@
+package io.picoclaw.android.core.data.repository
+
+import io.ktor.client.HttpClient
+import io.picoclaw.android.core.data.remote.WebSocketClient
+import io.picoclaw.android.core.data.remote.dto.WsIncoming
+import io.picoclaw.android.core.domain.model.AssistantMessage
+import io.picoclaw.android.core.domain.model.ConnectionState
+import io.picoclaw.android.core.domain.repository.AssistantConnection
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.launch
+import java.util.UUID
+
+class AssistantConnectionImpl(
+    private val httpClient: HttpClient
+) : AssistantConnection {
+
+    private val scope = CoroutineScope(SupervisorJob() + Dispatchers.IO)
+    private val clientId = UUID.randomUUID().toString()
+    private val wsClient = WebSocketClient(httpClient, scope, clientId, "assistant")
+
+    private val _messages = MutableSharedFlow<AssistantMessage>(extraBufferCapacity = 64)
+    override val messages: SharedFlow<AssistantMessage> = _messages.asSharedFlow()
+
+    private val _statusText = MutableStateFlow<String?>(null)
+    override val statusText: StateFlow<String?> = _statusText.asStateFlow()
+
+    override val connectionState: StateFlow<ConnectionState> = wsClient.connectionState
+
+    init {
+        scope.launch {
+            wsClient.incomingMessages.collect { dto ->
+                when (dto.type) {
+                    "status" -> _statusText.value = dto.content
+                    "status_end" -> _statusText.value = null
+                    else -> {
+                        _statusText.value = null
+                        _messages.emit(AssistantMessage(content = dto.content, type = dto.type))
+                    }
+                }
+            }
+        }
+    }
+
+    override fun connect(wsUrl: String) {
+        wsClient.wsUrl = wsUrl
+        wsClient.connect()
+    }
+
+    override fun disconnect() {
+        wsClient.disconnect()
+        scope.cancel()
+    }
+
+    override suspend fun send(text: String, images: List<String>, inputMode: String) {
+        val dto = WsIncoming(
+            content = text,
+            images = images.ifEmpty { null },
+            inputMode = inputMode
+        )
+        wsClient.send(dto)
+    }
+}

android/core/domain/src/main/java/io/picoclaw/android/core/domain/model/AssistantMessage.kt

@@ -0,0 +1,6 @@
+package io.picoclaw.android.core.domain.model
+
+data class AssistantMessage(
+    val content: String,
+    val type: String? = null
+)

android/core/domain/src/main/java/io/picoclaw/android/core/domain/repository/AssistantConnection.kt

@@ -0,0 +1,16 @@
+package io.picoclaw.android.core.domain.repository
+
+import io.picoclaw.android.core.domain.model.AssistantMessage
+import io.picoclaw.android.core.domain.model.ConnectionState
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.StateFlow
+
+interface AssistantConnection {
+    val messages: SharedFlow<AssistantMessage>
+    val statusText: StateFlow<String?>
+    val connectionState: StateFlow<ConnectionState>
+
+    fun connect(wsUrl: String)
+    fun disconnect()
+    suspend fun send(text: String, images: List<String> = emptyList(), inputMode: String = "assistant")
+}

android/feature/chat/src/main/java/io/picoclaw/android/feature/chat/assistant/AssistantManager.kt

@@ -0,0 +1,275 @@
+package io.picoclaw.android.feature.chat.assistant
+
+import android.content.ContentResolver
+import android.speech.SpeechRecognizer
+import android.util.Base64
+import android.util.Log
+import io.picoclaw.android.core.domain.model.AssistantMessage
+import io.picoclaw.android.core.domain.model.VoicePhase
+import io.picoclaw.android.core.domain.repository.AssistantConnection
+import io.picoclaw.android.feature.chat.voice.CameraCaptureManager
+import io.picoclaw.android.feature.chat.voice.SpeechRecognizerWrapper
+import io.picoclaw.android.feature.chat.voice.SttResult
+import io.picoclaw.android.feature.chat.voice.TextToSpeechWrapper
+import io.picoclaw.android.feature.chat.voice.VoiceModeState
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.selects.onTimeout
+import kotlinx.coroutines.selects.select
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class AssistantManager(
+    private val sttWrapper: SpeechRecognizerWrapper,
+    private val ttsWrapper: TextToSpeechWrapper,
+    private val connection: AssistantConnection,
+    private val cameraCaptureManager: CameraCaptureManager,
+    private val contentResolver: ContentResolver
+) {
+
+    private val _state = MutableStateFlow(VoiceModeState())
+    val state: StateFlow<VoiceModeState> = _state.asStateFlow()
+
+    private var loopJob: Job? = null
+    private var parentScope: CoroutineScope? = null
+
+    fun toggleCamera() {
+        _state.update { it.copy(isCameraActive = !it.isCameraActive) }
+    }
+
+    fun start(scope: CoroutineScope) {
+        if (loopJob?.isActive == true) return
+        parentScope = scope
+        _state.update {
+            VoiceModeState(isActive = true, phase = VoicePhase.LISTENING, isCameraActive = it.isCameraActive)
+        }
+        loopJob = scope.launch {
+            voiceLoop()
+        }
+    }
+
+    fun stop() {
+        loopJob?.cancel()
+        loopJob = null
+        parentScope = null
+        ttsWrapper.stop()
+        cameraCaptureManager.unbind()
+        _state.value = VoiceModeState()
+    }
+
+    fun interrupt() {
+        val scope = parentScope ?: return
+        if (loopJob?.isActive != true) return
+
+        ttsWrapper.stop()
+        loopJob?.cancel()
+        loopJob = null
+
+        _state.update {
+            VoiceModeState(isActive = true, phase = VoicePhase.LISTENING, isCameraActive = it.isCameraActive)
+        }
+        loopJob = scope.launch { voiceLoop() }
+    }
+
+    fun destroy() {
+        stop()
+    }
+
+    private suspend fun voiceLoop() = coroutineScope {
+        val speechQueue = Channel<String>(Channel.UNLIMITED)
+
+        val messageCollectorJob = launch {
+            connection.messages.collect { msg: AssistantMessage ->
+                if (msg.type == "warning" || msg.type == "error") {
+                    _state.update { it.copy(responseText = msg.content) }
+                } else {
+                    speechQueue.send(msg.content)
+                }
+            }
+        }
+
+        val statusCollectorJob = launch {
+            connection.statusText.collect { label ->
+                _state.update { it.copy(statusText = label) }
+            }
+        }
+
+        try {
+            while (isActive) {
+                _state.update {
+                    it.copy(
+                        phase = VoicePhase.LISTENING,
+                        recognizedText = "", responseText = "",
+                        statusText = null,
+                        errorMessage = null, amplitudeNormalized = 0f
+                    )
+                }
+
+                val userTextChannel = Channel<String?>(1)
+                val listenJob = launch {
+                    val text = listen()
+                    userTextChannel.send(text)
+                }
+
+                select<Unit> {
+                    userTextChannel.onReceive { text ->
+                        if (!text.isNullOrBlank()) {
+                            _state.update { it.copy(phase = VoicePhase.SENDING, recognizedText = text) }
+                            try {
+                                val base64Images = if (_state.value.isCameraActive) {
+                                    captureAndEncode()
+                                } else emptyList()
+                                connection.send(text, base64Images)
+                            } catch (e: Exception) {
+                                Log.w(TAG, "Failed to send message", e)
+                                _state.update {
+                                    it.copy(phase = VoicePhase.ERROR, errorMessage = "Failed to send")
+                                }
+                                delay(2000)
+                                return@onReceive
+                            }
+                            awaitAndSpeakResponse(speechQueue)
+                        } else {
+                            drainSpeechQueue(speechQueue)
+                        }
+                    }
+                    speechQueue.onReceive { content ->
+                        listenJob.cancel()
+                        speakAndDrain(content, speechQueue)
+                    }
+                }
+            }
+        } finally {
+            messageCollectorJob.cancel()
+            statusCollectorJob.cancel()
+            speechQueue.close()
+        }
+    }
+
+    private sealed interface WaitResult {
+        data class Message(val content: String) : WaitResult
+        data object Heartbeat : WaitResult
+        data object Timeout : WaitResult
+    }
+
+    private suspend fun awaitAndSpeakResponse(
+        speechQueue: Channel<String>
+    ) = coroutineScope {
+        val heartbeat = Channel<Unit>(Channel.CONFLATED)
+
+        val statusJob = launch {
+            connection.statusText.collect { label ->
+                if (label != null) heartbeat.trySend(Unit)
+            }
+        }
+
+        try {
+            _state.update { it.copy(phase = VoicePhase.THINKING, statusText = null) }
+
+            while (true) {
+                val result = select<WaitResult> {
+                    speechQueue.onReceive { WaitResult.Message(it) }
+                    heartbeat.onReceive { WaitResult.Heartbeat }
+                    onTimeout(30_000) { WaitResult.Timeout }
+                }
+
+                when (result) {
+                    WaitResult.Timeout -> {
+                        _state.update {
+                            it.copy(phase = VoicePhase.ERROR, errorMessage = "Response timed out")
+                        }
+                        delay(2000)
+                        return@coroutineScope
+                    }
+                    WaitResult.Heartbeat -> continue
+                    is WaitResult.Message -> {
+                        speakAndDrain(result.content, speechQueue)
+                        val currentStatus = connection.statusText.value
+                        if (currentStatus == null) return@coroutineScope
+                        _state.update {
+                            it.copy(phase = VoicePhase.THINKING, statusText = currentStatus)
+                        }
+                    }
+                }
+            }
+        } finally {
+            statusJob.cancel()
+        }
+    }
+
+    private suspend fun speakAndDrain(firstContent: String, speechQueue: Channel<String>) {
+        _state.update { it.copy(phase = VoicePhase.SPEAKING, responseText = firstContent) }
+        ttsWrapper.speak(firstContent)
+        while (true) {
+            val next = speechQueue.tryReceive().getOrNull() ?: break
+            _state.update { it.copy(responseText = next) }
+            ttsWrapper.speak(next)
+        }
+    }
+
+    private suspend fun drainSpeechQueue(speechQueue: Channel<String>) {
+        val first = speechQueue.tryReceive().getOrNull() ?: return
+        speakAndDrain(first, speechQueue)
+    }
+
+    private suspend fun listen(): String? {
+        var finalText: String? = null
+        sttWrapper.startListening().collect { result ->
+            when (result) {
+                is SttResult.Partial -> {
+                    _state.update { it.copy(recognizedText = result.text) }
+                }
+                is SttResult.Final -> {
+                    finalText = result.text
+                }
+                is SttResult.RmsChanged -> {
+                    val normalized = ((result.rms + 2f) / 12f).coerceIn(0f, 1f)
+                    _state.update { it.copy(amplitudeNormalized = normalized) }
+                }
+                is SttResult.Error -> {
+                    if (result.code == SpeechRecognizer.ERROR_NO_MATCH ||
+                        result.code == SpeechRecognizer.ERROR_SPEECH_TIMEOUT
+                    ) {
+                        finalText = ""
+                    } else {
+                        _state.update {
+                            it.copy(
+                                phase = VoicePhase.ERROR,
+                                errorMessage = "Speech recognition error (code=${result.code})"
+                            )
+                        }
+                        delay(2000)
+                        finalText = null
+                    }
+                }
+            }
+        }
+        return finalText
+    }
+
+    private suspend fun captureAndEncode(): List<String> {
+        val attachment = cameraCaptureManager.captureFrame() ?: return emptyList()
+        val uri = android.net.Uri.parse(attachment.uri)
+        return try {
+            val bytes = contentResolver.openInputStream(uri)?.use { it.readBytes() }
+                ?: return emptyList()
+            listOf(Base64.encodeToString(bytes, Base64.NO_WRAP))
+        } catch (e: Exception) {
+            Log.w(TAG, "Failed to encode captured image", e)
+            emptyList()
+        }
+    }
+
+    companion object {
+        private const val TAG = "AssistantManager"
+    }
+}

android/feature/chat/src/main/java/io/picoclaw/android/feature/chat/assistant/AssistantPillBar.kt

@@ -0,0 +1,312 @@
+package io.picoclaw.android.feature.chat.assistant
+
+import androidx.camera.view.PreviewView
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.animateContentSize
+import androidx.compose.animation.core.LinearEasing
+import androidx.compose.animation.core.RepeatMode
+import androidx.compose.animation.core.animateFloat
+import androidx.compose.animation.core.infiniteRepeatable
+import androidx.compose.animation.core.rememberInfiniteTransition
+import androidx.compose.animation.core.tween
+import androidx.compose.animation.expandVertically
+import androidx.compose.animation.shrinkVertically
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
+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.fillMaxSize
+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.layout.width
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.graphics.Brush
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.viewinterop.AndroidView
+import androidx.lifecycle.compose.LocalLifecycleOwner
+import io.picoclaw.android.core.domain.model.VoicePhase
+import io.picoclaw.android.core.ui.theme.GradientCyan
+import io.picoclaw.android.core.ui.theme.TextPrimary
+import io.picoclaw.android.core.ui.theme.TextSecondary
+import io.picoclaw.android.feature.chat.voice.CameraCaptureManager
+import io.picoclaw.android.feature.chat.voice.VoiceModeState
+import com.composables.icons.lucide.R as LucideR
+import kotlin.math.PI
+import kotlin.math.sin
+
+private val PillBackground = Color(0xE6141428)
+private val ListeningColor = Color(0xFF00D4FF)
+private val ThinkingColor = Color(0xFFA855F7)
+private val SpeakingColor = Color(0xFF22C55E)
+private val ErrorColor = Color(0xFFEF4444)
+
+@Composable
+fun AssistantPillBar(
+    state: VoiceModeState,
+    onClose: () -> Unit,
+    onInterrupt: () -> Unit,
+    onCameraToggle: () -> Unit,
+    cameraCaptureManager: CameraCaptureManager,
+    modifier: Modifier = Modifier
+) {
+    val isExpanded = state.phase == VoicePhase.THINKING ||
+        state.phase == VoicePhase.SPEAKING ||
+        state.phase == VoicePhase.ERROR
+
+    val interruptable = state.phase != VoicePhase.LISTENING &&
+        state.phase != VoicePhase.IDLE
+
+    Column(
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(horizontal = 8.dp, vertical = 8.dp)
+    ) {
+        // Camera preview above the pill bar
+        AnimatedVisibility(
+            visible = state.isCameraActive,
+            enter = expandVertically(expandFrom = Alignment.Bottom),
+            exit = shrinkVertically(shrinkTowards = Alignment.Bottom)
+        ) {
+            val lifecycleOwner = LocalLifecycleOwner.current
+
+            Box(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(bottom = 8.dp),
+                contentAlignment = Alignment.CenterEnd
+            ) {
+                Box(
+                    modifier = Modifier
+                        .width(120.dp)
+                        .height(90.dp)
+                        .clip(RoundedCornerShape(12.dp))
+                ) {
+                    AndroidView(
+                        factory = { ctx ->
+                            PreviewView(ctx).also { preview ->
+                                cameraCaptureManager.bind(lifecycleOwner, preview)
+                            }
+                        },
+                        modifier = Modifier.fillMaxSize()
+                    )
+                }
+            }
+
+            DisposableEffect(Unit) {
+                onDispose {
+                    cameraCaptureManager.unbind()
+                }
+            }
+        }
+
+        // Main pill bar
+        Box(
+            modifier = Modifier
+                .fillMaxWidth()
+                .clip(RoundedCornerShape(24.dp))
+                .background(
+                    Brush.verticalGradient(
+                        colors = listOf(
+                            PillBackground,
+                            PillBackground.copy(alpha = 0.95f)
+                        )
+                    )
+                )
+                .then(
+                    if (interruptable) {
+                        Modifier.clickable(
+                            indication = null,
+                            interactionSource = remember { MutableInteractionSource() }
+                        ) { onInterrupt() }
+                    } else Modifier
+                )
+                .animateContentSize()
+        ) {
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(16.dp)
+            ) {
+                // Expanded content: response text area
+                AnimatedVisibility(
+                    visible = isExpanded && (state.responseText.isNotEmpty() || state.errorMessage != null)
+                ) {
+                    Column(modifier = Modifier.padding(bottom = 12.dp)) {
+                        if (state.responseText.isNotEmpty()) {
+                            Text(
+                                text = state.responseText,
+                                style = MaterialTheme.typography.bodyMedium,
+                                color = TextPrimary,
+                                maxLines = 6,
+                                overflow = TextOverflow.Ellipsis
+                            )
+                        }
+                        if (state.errorMessage != null) {
+                            Text(
+                                text = state.errorMessage,
+                                style = MaterialTheme.typography.bodySmall,
+                                color = ErrorColor
+                            )
+                        }
+                    }
+                }
+
+                // Status / recognized text row
+                AnimatedVisibility(
+                    visible = isExpanded && (state.recognizedText.isNotEmpty() || state.statusText != null)
+                ) {
+                    Text(
+                        text = state.statusText ?: state.recognizedText,
+                        style = MaterialTheme.typography.bodySmall,
+                        color = TextSecondary,
+                        maxLines = 1,
+                        overflow = TextOverflow.Ellipsis,
+                        modifier = Modifier.padding(bottom = 8.dp)
+                    )
+                }
+
+                // Bottom row: waveform + controls
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    // Mic icon
+                    Icon(
+                        painter = painterResource(LucideR.drawable.lucide_ic_mic),
+                        contentDescription = "Microphone",
+                        modifier = Modifier.size(20.dp),
+                        tint = phaseColor(state.phase)
+                    )
+
+                    Spacer(modifier = Modifier.width(8.dp))
+
+                    // Waveform
+                    WaveformBar(
+                        phase = state.phase,
+                        amplitude = state.amplitudeNormalized,
+                        modifier = Modifier
+                            .weight(1f)
+                            .height(28.dp)
+                    )
+
+                    Spacer(modifier = Modifier.width(8.dp))
+
+                    // Camera toggle
+                    IconButton(
+                        onClick = onCameraToggle,
+                        modifier = Modifier.size(36.dp)
+                    ) {
+                        Icon(
+                            painter = painterResource(
+                                if (state.isCameraActive) LucideR.drawable.lucide_ic_camera_off
+                                else LucideR.drawable.lucide_ic_camera
+                            ),
+                            contentDescription = if (state.isCameraActive) "Turn off camera" else "Turn on camera",
+                            modifier = Modifier.size(18.dp),
+                            tint = if (state.isCameraActive) GradientCyan else TextSecondary
+                        )
+                    }
+
+                    // Close button
+                    IconButton(
+                        onClick = onClose,
+                        modifier = Modifier.size(36.dp)
+                    ) {
+                        Icon(
+                            painter = painterResource(LucideR.drawable.lucide_ic_x),
+                            contentDescription = "Close",
+                            modifier = Modifier.size(18.dp),
+                            tint = TextSecondary
+                        )
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun WaveformBar(
+    phase: VoicePhase,
+    amplitude: Float,
+    modifier: Modifier = Modifier
+) {
+    val transition = rememberInfiniteTransition(label = "waveform")
+    val animPhase by transition.animateFloat(
+        initialValue = 0f,
+        targetValue = 2f * PI.toFloat(),
+        animationSpec = infiniteRepeatable(
+            animation = tween(durationMillis = 1500, easing = LinearEasing),
+            repeatMode = RepeatMode.Restart
+        ),
+        label = "wavePhase"
+    )
+
+    val color = phaseColor(phase)
+
+    Canvas(modifier = modifier) {
+        val barCount = 32
+        val barWidth = size.width / barCount
+        val centerY = size.height / 2f
+
+        for (i in 0 until barCount) {
+            val x = i * barWidth + barWidth / 2f
+            val normalizedX = i.toFloat() / barCount
+
+            val barHeight = when (phase) {
+                VoicePhase.LISTENING -> {
+                    val wave = sin(normalizedX * 4f * PI.toFloat() + animPhase).coerceIn(-1f, 1f)
+                    val base = 0.15f
+                    val dynamic = amplitude * 0.85f * ((wave + 1f) / 2f)
+                    (base + dynamic) * size.height
+                }
+                VoicePhase.THINKING -> {
+                    val wave = sin(normalizedX * 3f * PI.toFloat() + animPhase * 2f)
+                    (0.2f + 0.15f * ((wave + 1f) / 2f)) * size.height
+                }
+                VoicePhase.SPEAKING -> {
+                    val wave = sin(normalizedX * 5f * PI.toFloat() + animPhase * 1.5f)
+                    (0.2f + 0.4f * ((wave + 1f) / 2f)) * size.height
+                }
+                else -> 0.1f * size.height
+            }
+
+            drawLine(
+                color = color.copy(alpha = 0.6f + 0.4f * (barHeight / size.height)),
+                start = Offset(x, centerY - barHeight / 2f),
+                end = Offset(x, centerY + barHeight / 2f),
+                strokeWidth = barWidth * 0.5f
+            )
+        }
+    }
+}
+
+private fun phaseColor(phase: VoicePhase): Color = when (phase) {
+    VoicePhase.LISTENING -> ListeningColor
+    VoicePhase.SENDING -> Color(0xFFFF8C42)
+    VoicePhase.THINKING -> ThinkingColor
+    VoicePhase.SPEAKING -> SpeakingColor
+    VoicePhase.ERROR -> ErrorColor
+    VoicePhase.IDLE -> Color(0xFF4A5568)
+}