fix: add FOREGROUND_SERVICE_TYPE_CAMERA to keep camera alive across turns

The camera preview went black on the 2nd assistant turn because
AssistantService lacked the camera foreground service type, causing
Android 14+ to revoke camera access after the grace period.

- Declare FOREGROUND_SERVICE_CAMERA permission and foregroundServiceType
- Dynamically include CAMERA type in startForeground when permitted
- Replace ImageCapture.takePicture with PreviewView.bitmap to avoid
  disrupting the preview pipeline
- Add ImplementationMode.COMPATIBLE to VoiceModeOverlay PreviewView
- Move capture file I/O to Dispatchers.IO with proper error handling

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

android/app/src/main/AndroidManifest.xml

@@ -7,6 +7,7 @@
     <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_CAMERA" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MICROPHONE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE" />
 
@@ -76,7 +77,7 @@
         <service
             android:name=".assistant.AssistantService"
             android:exported="false"
-            android:foregroundServiceType="microphone|specialUse">
+            android:foregroundServiceType="camera|microphone|specialUse">
             <property
                 android:name="android.app.PROPERTY_SPECIAL_USE_FGS_SUBTYPE"
                 android:value="AI voice assistant overlay for real-time conversation" />

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

@@ -75,6 +75,7 @@ class AssistantService : LifecycleService(), SavedStateRegistryOwner {
             val permission = intent.getStringExtra(PermissionRequestActivity.EXTRA_PERMISSION)
             val granted = intent.getBooleanExtra(PermissionRequestActivity.EXTRA_GRANTED, false)
             if (permission == Manifest.permission.CAMERA && granted) {
+                startForeground(NOTIFICATION_ID, buildNotification(), computeForegroundTypes())
                 assistantManager.toggleCamera()
             }
         }
@@ -115,8 +116,7 @@ class AssistantService : LifecycleService(), SavedStateRegistryOwner {
         startForeground(
             NOTIFICATION_ID,
             buildNotification(),
-            ServiceInfo.FOREGROUND_SERVICE_TYPE_MICROPHONE
-                or ServiceInfo.FOREGROUND_SERVICE_TYPE_SPECIAL_USE
+            computeForegroundTypes()
         )
 
         // Resolve wsUrl from the main WebSocketClient
@@ -152,6 +152,7 @@ class AssistantService : LifecycleService(), SavedStateRegistryOwner {
         if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
             == PackageManager.PERMISSION_GRANTED
         ) {
+            startForeground(NOTIFICATION_ID, buildNotification(), computeForegroundTypes())
             assistantManager.toggleCamera()
         } else {
             startActivity(PermissionRequestActivity.intent(this, Manifest.permission.CAMERA))
@@ -233,6 +234,17 @@ class AssistantService : LifecycleService(), SavedStateRegistryOwner {
         }
     }
 
+    private fun computeForegroundTypes(): Int {
+        var types = ServiceInfo.FOREGROUND_SERVICE_TYPE_MICROPHONE or
+            ServiceInfo.FOREGROUND_SERVICE_TYPE_SPECIAL_USE
+        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
+            == PackageManager.PERMISSION_GRANTED
+        ) {
+            types = types or ServiceInfo.FOREGROUND_SERVICE_TYPE_CAMERA
+        }
+        return types
+    }
+
     private fun buildNotification(): Notification {
         return NotificationCompat.Builder(this, NotificationHelper.ASSISTANT_CHANNEL_ID)
             .setSmallIcon(android.R.drawable.ic_btn_speak_now)

android/feature/chat/src/main/java/io/picoclaw/android/feature/chat/voice/CameraCaptureManager.kt

@@ -1,23 +1,21 @@
 package io.picoclaw.android.feature.chat.voice
 
 import android.content.Context
+import android.graphics.Bitmap
 import android.util.Log
 import androidx.camera.core.CameraSelector
-import androidx.camera.core.ImageCapture
-import androidx.camera.core.ImageCaptureException
 import androidx.camera.core.Preview
 import androidx.camera.lifecycle.ProcessCameraProvider
 import androidx.camera.view.PreviewView
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.LifecycleOwner
 import io.picoclaw.android.core.domain.model.ImageAttachment
-import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
 import java.io.File
-import kotlin.coroutines.resume
 
 class CameraCaptureManager(private val context: Context) {
 
-    private var imageCapture: ImageCapture? = null
     private var cameraProvider: ProcessCameraProvider? = null
     private var currentPreviewView: PreviewView? = null
 
@@ -39,17 +37,11 @@ class CameraCaptureManager(private val context: Context) {
                     it.surfaceProvider = previewView.surfaceProvider
                 }
 
-                val capture = ImageCapture.Builder()
-                    .setCaptureMode(ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY)
-                    .build()
-                imageCapture = capture
-
                 provider.unbindAll()
                 provider.bindToLifecycle(
                     lifecycleOwner,
                     CameraSelector.DEFAULT_BACK_CAMERA,
-                    preview,
-                    capture
+                    preview
                 )
             } catch (e: Exception) {
                 Log.w(TAG, "Failed to bind camera", e)
@@ -60,35 +52,26 @@ class CameraCaptureManager(private val context: Context) {
     fun unbind() {
         cameraProvider?.unbindAll()
         cameraProvider = null
-        imageCapture = null
         currentPreviewView = null
     }
 
     suspend fun captureFrame(): ImageAttachment? {
-        val capture = imageCapture ?: return null
-        val imagesDir = File(context.cacheDir, "images").apply { mkdirs() }
-        val file = File(imagesDir, "voice_cam_${System.currentTimeMillis()}.jpg")
-        val outputOptions = ImageCapture.OutputFileOptions.Builder(file).build()
-
-        return suspendCancellableCoroutine { cont ->
-            capture.takePicture(
-                outputOptions,
-                ContextCompat.getMainExecutor(context),
-                object : ImageCapture.OnImageSavedCallback {
-                    override fun onImageSaved(output: ImageCapture.OutputFileResults) {
-                        val uri = androidx.core.content.FileProvider.getUriForFile(
-                            context,
-                            "${context.packageName}.fileprovider",
-                            file
-                        )
-                        cont.resume(ImageAttachment(uri = uri.toString()))
-                    }
-
-                    override fun onError(exception: ImageCaptureException) {
-                        cont.resume(null)
-                    }
-                }
-            )
+        val bitmap = currentPreviewView?.bitmap ?: return null
+        return try {
+            withContext(Dispatchers.IO) {
+                val imagesDir = File(context.cacheDir, "images").apply { mkdirs() }
+                val file = File(imagesDir, "voice_cam_${System.currentTimeMillis()}.jpg")
+                file.outputStream().use { bitmap.compress(Bitmap.CompressFormat.JPEG, 80, it) }
+                val uri = androidx.core.content.FileProvider.getUriForFile(
+                    context,
+                    "${context.packageName}.fileprovider",
+                    file
+                )
+                ImageAttachment(uri = uri.toString())
+            }
+        } catch (e: Exception) {
+            Log.w(TAG, "Failed to capture frame", e)
+            null
         }
     }
 

android/feature/chat/src/main/java/io/picoclaw/android/feature/chat/voice/VoiceModeOverlay.kt

@@ -1,6 +1,7 @@
 package io.picoclaw.android.feature.chat.voice
 
 import androidx.camera.view.PreviewView
+import androidx.camera.view.PreviewView.ImplementationMode
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
@@ -177,8 +178,9 @@ fun VoiceModeOverlay(
                     ) {
                         AndroidView(
                             factory = { ctx ->
-                                PreviewView(ctx).also { preview ->
-                                    cameraCaptureManager.bind(lifecycleOwner, preview)
+                                PreviewView(ctx).apply {
+                                    implementationMode = ImplementationMode.COMPATIBLE
+                                    cameraCaptureManager.bind(lifecycleOwner, this)
                                 }
                             },
                             modifier = Modifier.fillMaxSize()