feat(#1247): hold-to-record voice notes with server-side transcription (#1250)

Co-authored-by: M57 <41645758+Hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/ui/chat/ChatScreen.kt

@@ -440,12 +440,16 @@ fun ChatScreen(
             onAddAttachments = { attachments ->
                 viewModel.addAttachments(attachments)
             },
+            onVoiceNoteRecorded = { file ->
+                viewModel.sendVoiceNote(file)
+            },
             onShowMessage = { msg ->
                 scrollScope.launch {
                     snackbarHostState.showSnackbar(msg)
                 }
             },
             launchExternalActivity = launchExternalActivity,
+            isTranscribingVoiceNote = state.isTranscribingVoiceNote,
             context = context,
         )
 
@@ -901,9 +905,16 @@ fun ChatScreen(
                     }
                 },
                 onMicTap = mediaLaunchers.onMicTap,
-                isListening = mediaLaunchers.isListening,
+                onMicHoldStart = mediaLaunchers.onMicHoldStart,
+                onMicHoldEnd = mediaLaunchers.onMicHoldEnd,
+                onMicHoldCancel = mediaLaunchers.onMicHoldCancel,
+                isListening = mediaLaunchers.isListening || state.isTranscribingVoiceNote,
+                isRecordingVoice = mediaLaunchers.isRecordingVoice,
+                voiceNoteAmplitude = mediaLaunchers.voiceNoteAmplitude,
+                onStopGeneration = { viewModel.interruptSession() },
                 isAgentTyping = state.isAgentTyping,
                 isMainTurnBusy = state.isMainTurnBusy,
+                canInterrupt = state.canInterrupt,
                 isConnected = state.isConnected,
                 isSessionReady = state.isSessionReady && !timelineState.isHistorical,
                 sessionPreparationFailed = state.resumeError != null,

app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt

@@ -6,6 +6,7 @@ import android.util.Log
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import com.m57.hermescontrol.data.local.AuthManager
+import com.m57.hermescontrol.data.local.DataScope
 import com.m57.hermescontrol.data.local.HermesDatabase
 import com.m57.hermescontrol.data.local.SlashUsageStore
 import com.m57.hermescontrol.data.model.Attachment
@@ -22,6 +23,7 @@ import com.m57.hermescontrol.data.remote.ApiClient
 import com.m57.hermescontrol.data.remote.NetworkResult
 import com.m57.hermescontrol.data.remote.OkHttpProvider
 import com.m57.hermescontrol.data.remote.safeApiCall
+import com.m57.hermescontrol.data.repository.VoiceNoteRepository
 import com.m57.hermescontrol.data.session.ActiveSessionHolder
 import com.m57.hermescontrol.data.session.ProfileSwitchCoordinator
 import com.m57.hermescontrol.data.ws.CommandBlocklist
@@ -66,6 +68,11 @@ private const val TAG = "ChatViewModel"
 private const val MESSAGE_PAGE_SIZE = 150
 private const val TIMELINE_PAGE_SIZE = 500
 private const val HISTORY_WINDOW_SIZE = 120
+private const val VOICE_NOTE_OFFLINE_MESSAGE = "Voice note not sent — not connected"
+private const val VOICE_NOTE_EMPTY_MESSAGE = "No speech detected in the voice note"
+private const val VOICE_NOTE_FAILED_MESSAGE = "Voice note transcription failed"
+private const val VOICE_NOTE_UNSENT_MESSAGE =
+    "Voice note not sent — transcript kept in the input field"
 
 private val REASONING_EFFORT_LEVELS =
     setOf("none", "minimal", "low", "medium", "high", "xhigh", "max", "ultra")
@@ -135,6 +142,8 @@ data class ChatUiState(
     val pendingSends: List<PendingSend> = emptyList(),
     val isThinking: Boolean = false,
     val thinkingText: String = "",
+    /** True while a recorded voice note uploads for server-side transcription. */
+    val isTranscribingVoiceNote: Boolean = false,
     val isLoading: Boolean = false,
     val isLoadingOlder: Boolean = false,
     val hasOlderMessages: Boolean = false,
@@ -255,6 +264,15 @@ data class ChatUiState(
 ) {
     /** Convenience — derived from [connectionStatus]. */
     val isConnected: Boolean get() = connectionStatus == ConnectionStatus.CONNECTED
+
+    /**
+     * True only while a generation can actually be interrupted: typing can
+     * start during session preparation, before any runtime session exists,
+     * and `session.interrupt` has nothing to stop then. The composer derives
+     * its Stop affordance from this instead of [isAgentTyping] alone
+     * (review, PR #1250).
+     */
+    val canInterrupt: Boolean get() = isAgentTyping && isSessionReady
 }
 
 data class ChatTimelineState(
@@ -414,6 +432,7 @@ class ChatViewModel(
     private val ioDispatcher: kotlinx.coroutines.CoroutineDispatcher = kotlinx.coroutines.Dispatchers.IO,
     private val historyDispatcher: kotlinx.coroutines.CoroutineDispatcher = searchDispatcher,
     private val sendStore: ChatSendStore = ChatSendStore(application),
+    private val voiceNoteRepository: VoiceNoteRepository = VoiceNoteRepository(),
 ) : AndroidViewModel(application) {
     constructor(application: Application) : this(application, startCleanup = true)
 
@@ -2874,6 +2893,113 @@ class ChatViewModel(
         return true
     }
 
+    /** True while a voice-note transcription owns the mic-to-send pipeline. */
+    private var voiceNoteTranscriptionInFlight = false
+
+    /**
+     * Transcribe a recorded voice note through the dashboard's server-side
+     * STT relay (`POST /api/audio/transcribe` — the desktop client's voice
+     * path) and submit the transcript as the next message. The profile's
+     * configured STT provider answers, not the phone's on-device recognizer.
+     *
+     * The recording belongs to the session that was active when it was taken:
+     * transcription takes long enough for the socket, the profile, or the user
+     * to move on, so a transcript that can no longer land in that session or
+     * connection/profile scope is preserved in the composer instead of being
+     * dropped. Only one
+     * transcription runs at a time — [voiceNoteTranscriptionInFlight] keeps
+     * every branch below single-flight (review, PR #1250).
+     */
+    fun sendVoiceNote(file: File) {
+        if (voiceNoteTranscriptionInFlight) {
+            file.delete()
+            return
+        }
+        if (!canSubmitMessage()) {
+            file.delete()
+            _uiState.update { it.copy(errorMessage = VOICE_NOTE_OFFLINE_MESSAGE) }
+            return
+        }
+        val recordedSessionId = _uiState.value.currentSessionId
+        val recordedRuntimeSessionId = runtimeSessionId
+        // The recording also belongs to the connection/profile scope it was
+        // taken on: both session IDs can still be null/null across a scope
+        // switch while a replacement session create is pending, so the data
+        // scope is the deciding identity for that window (review, PR #1250).
+        val recordedDataScope = AuthManager.currentDataScope()
+        voiceNoteTranscriptionInFlight = true
+        viewModelScope.launch {
+            _uiState.update { it.copy(isTranscribingVoiceNote = true) }
+            try {
+                val result =
+                    withContext(ioDispatcher) {
+                        try {
+                            voiceNoteRepository.transcribe(file)
+                        } finally {
+                            file.delete()
+                        }
+                    }
+                when (result) {
+                    is NetworkResult.Success -> {
+                        val transcript = result.data.trim()
+                        if (transcript.isEmpty()) {
+                            _uiState.update { it.copy(errorMessage = VOICE_NOTE_EMPTY_MESSAGE) }
+                        } else {
+                            deliverVoiceTranscript(
+                                transcript = transcript,
+                                recordedSessionId = recordedSessionId,
+                                recordedRuntimeSessionId = recordedRuntimeSessionId,
+                                recordedDataScope = recordedDataScope,
+                            )
+                        }
+                    }
+
+                    is NetworkResult.Failure -> {
+                        Log.w(TAG, "Voice note transcription failed: ${result.error.message}")
+                        _uiState.update {
+                            it.copy(errorMessage = "$VOICE_NOTE_FAILED_MESSAGE: ${result.error.message}")
+                        }
+                    }
+                }
+            } finally {
+                // Always release the single-flight flag and the composer's
+                // transcription state, even if a branch above throws.
+                voiceNoteTranscriptionInFlight = false
+                _uiState.update { it.copy(isTranscribingVoiceNote = false) }
+            }
+        }
+    }
+
+    /**
+     * Submits a transcribed voice note, or keeps the transcript in the input
+     * field when it can no longer land where it was recorded. The recording
+     * file is already deleted by now, so a rejected send restores the text
+     * instead of losing it.
+     */
+    private fun deliverVoiceTranscript(
+        transcript: String,
+        recordedSessionId: String?,
+        recordedRuntimeSessionId: String?,
+        recordedDataScope: DataScope?,
+    ) {
+        val sessionChanged =
+            _uiState.value.currentSessionId != recordedSessionId ||
+                runtimeSessionId != recordedRuntimeSessionId
+        // A connection/profile switch can leave the session IDs null on both
+        // sides of the recording (a replacement session create may still be
+        // pending), so the data scope is the ownership check that catches
+        // that move (review, PR #1250).
+        val scopeChanged = AuthManager.currentDataScope() != recordedDataScope
+        if (sessionChanged || scopeChanged || !sendMessage(transcript)) {
+            _uiState.update {
+                it.copy(
+                    composerTextToRestore = transcript,
+                    errorMessage = VOICE_NOTE_UNSENT_MESSAGE,
+                )
+            }
+        }
+    }
+
     private fun canSubmitMessage(): Boolean =
         _uiState.value.pendingReasoningLevel == null &&
             wsClient.connectionStatus.value == ConnectionStatus.CONNECTED &&

app/src/main/java/com/m57/hermescontrol/ui/chat/VoiceNoteRecorder.kt

@@ -0,0 +1,120 @@
+package com.m57.hermescontrol.ui.chat
+
+import android.content.Context
+import android.media.MediaRecorder
+import android.os.Build
+import android.os.SystemClock
+import android.util.Log
+import java.io.File
+
+/**
+ * Records a hold-to-talk voice note as an MPEG-4/AAC file in the app cache.
+ *
+ * One instance drives one in-flight recording; the call site owns UI state and
+ * decides what to do with the clip. 16 kHz mono AAC keeps the payload small
+ * (roughly 0.5 MB at [MAX_DURATION_MS]) so it uploads quickly to the
+ * dashboard's transcription endpoint.
+ */
+class VoiceNoteRecorder(
+    private val context: Context,
+) {
+    companion object {
+        private const val TAG = "VoiceNoteRecorder"
+
+        /** Clips shorter than this are treated as accidental and discarded. */
+        const val MIN_DURATION_MS = 500L
+
+        /**
+         * Hard cap. The call site (ChatMediaLaunchers) owns the timer and
+         * drives the single stop path — the recorder itself no longer stops
+         * recording, so MediaRecorder's auto-stop cannot race the
+         * hold-release stop (review, PR #1250).
+         */
+        const val MAX_DURATION_MS = 120_000
+    }
+
+    private var recorder: MediaRecorder? = null
+    private var outputFile: File? = null
+    private var startedAtMs = 0L
+
+    val isActive: Boolean
+        get() = recorder != null
+
+    /** Starts recording. Returns false when the microphone is unavailable. */
+    fun start(): Boolean {
+        if (recorder != null) return false
+        val file =
+            runCatching { File.createTempFile("voice_", ".m4a", context.cacheDir) }
+                .getOrNull()
+                ?: return false
+        return try {
+            val mediaRecorder =
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+                    MediaRecorder(context)
+                } else {
+                    @Suppress("DEPRECATION")
+                    MediaRecorder()
+                }
+            mediaRecorder.apply {
+                setAudioSource(MediaRecorder.AudioSource.MIC)
+                setOutputFormat(MediaRecorder.OutputFormat.MPEG_4)
+                setAudioEncoder(MediaRecorder.AudioEncoder.AAC)
+                setAudioSamplingRate(16_000)
+                setAudioEncodingBitRate(32_000)
+                setAudioChannels(1)
+                setOutputFile(file.absolutePath)
+                prepare()
+                start()
+            }
+            recorder = mediaRecorder
+            outputFile = file
+            startedAtMs = SystemClock.elapsedRealtime()
+            Log.i(TAG, "Voice note recording started: ${file.name}")
+            true
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to start voice note recording", e)
+            releaseQuietly()
+            file.delete()
+            false
+        }
+    }
+
+    /**
+     * Stops recording and returns the clip when it is long enough to send.
+     * Returns null for too-short or failed recordings — the temp file is
+     * removed in both cases.
+     */
+    fun stop(): File? {
+        val active = recorder ?: return null
+        val file = outputFile
+        val durationMs = SystemClock.elapsedRealtime() - startedAtMs
+        val stopped = runCatching { active.stop() }.isSuccess
+        releaseQuietly()
+        val byteCount = file?.length() ?: -1L
+        Log.i(TAG, "Voice note stop: durationMs=$durationMs stopped=$stopped bytes=$byteCount")
+        if (!stopped || file == null || durationMs < MIN_DURATION_MS) {
+            file?.delete()
+            return null
+        }
+        return file
+    }
+
+    /** Aborts the recording and deletes the clip. */
+    fun cancel() {
+        if (recorder != null) {
+            runCatching { recorder?.stop() }
+        }
+        releaseQuietly()
+        outputFile?.delete()
+    }
+
+    /** Peak amplitude of the current recording window — 0 when idle. */
+    fun currentAmplitude(): Int = runCatching { recorder?.maxAmplitude ?: 0 }.getOrDefault(0)
+
+    private fun releaseQuietly() {
+        runCatching { recorder?.release() }
+        recorder = null
+        outputFile = null
+        startedAtMs = 0L
+    }
+}

app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatComposer.kt

@@ -39,6 +39,7 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.State
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -83,6 +84,7 @@ fun ChatInputBar(
     isListening: Boolean,
     isAgentTyping: Boolean,
     isMainTurnBusy: Boolean = false,
+    canInterrupt: Boolean = false,
     isConnected: Boolean,
     commandCatalog: CommandCatalog,
     isSessionReady: Boolean,
@@ -108,6 +110,12 @@ fun ChatInputBar(
     showModelProvider: Boolean = false,
     reasoningWireLevel: String? = null,
     pendingReasoningLevel: String? = null,
+    onMicHoldStart: () -> Unit = {},
+    onMicHoldEnd: () -> Unit = {},
+    onMicHoldCancel: () -> Unit = {},
+    isRecordingVoice: Boolean = false,
+    voiceNoteAmplitude: State<Float> = remember { mutableStateOf(0f) },
+    onStopGeneration: () -> Unit = {},
 ) {
     // Allow sending while the agent is mid-turn or awaiting approval: the
     // gateway's prompt.submit busy-input policy queues it as the next turn
@@ -269,55 +277,64 @@ fun ChatInputBar(
                         }
                     val isInputRtl = inputLayoutDirection == LayoutDirection.Rtl
 
-                    CompositionLocalProvider(LocalLayoutDirection provides inputLayoutDirection) {
-                        BasicTextField(
-                            value = inputFieldValue,
-                            onValueChange = onInputChange,
-                            modifier =
-                                Modifier
-                                    .weight(1f)
-                                    .heightIn(min = 42.dp, max = 200.dp)
-                                    .padding(vertical = 4.dp)
-                                    .testTag("chat_input"),
-                            enabled = isConnected,
-                            textStyle =
-                                MaterialTheme.typography.bodyLarge.copy(
-                                    color = palette.text,
-                                    textAlign = if (isInputRtl) TextAlign.Right else TextAlign.Left,
-                                    textDirection = if (isInputRtl) TextDirection.Rtl else TextDirection.Ltr,
-                                ),
-                            singleLine = false,
-                            maxLines = 8,
-                            cursorBrush = SolidColor(palette.text),
-                            decorationBox = { innerTextField ->
-                                CompositionLocalProvider(LocalLayoutDirection provides ambientLayoutDirection) {
-                                    Box(
-                                        modifier = Modifier.fillMaxWidth(),
-                                        contentAlignment =
-                                            if (isInputRtl) {
-                                                Alignment.CenterEnd
-                                            } else {
-                                                Alignment.CenterStart
-                                            },
-                                    ) {
-                                        CompositionLocalProvider(LocalLayoutDirection provides inputLayoutDirection) {
-                                            if (inputFieldValue.text.isEmpty()) {
-                                                Text(
-                                                    text = placeholderText,
-                                                    style = MaterialTheme.typography.bodyLarge,
-                                                    textAlign = if (isInputRtl) TextAlign.Right else TextAlign.Left,
-                                                    color = palette.placeholder,
-                                                    maxLines = 1,
-                                                    overflow = TextOverflow.Ellipsis,
-                                                    modifier = Modifier.fillMaxWidth(),
-                                                )
+                    if (isRecordingVoice) {
+                        VoiceNoteRecordingPanel(
+                            amplitude = voiceNoteAmplitude,
+                            modifier = Modifier.weight(1f),
+                        )
+                    } else {
+                        CompositionLocalProvider(LocalLayoutDirection provides inputLayoutDirection) {
+                            BasicTextField(
+                                value = inputFieldValue,
+                                onValueChange = onInputChange,
+                                modifier =
+                                    Modifier
+                                        .weight(1f)
+                                        .heightIn(min = 42.dp, max = 200.dp)
+                                        .padding(vertical = 4.dp)
+                                        .testTag("chat_input"),
+                                enabled = isConnected,
+                                textStyle =
+                                    MaterialTheme.typography.bodyLarge.copy(
+                                        color = palette.text,
+                                        textAlign = if (isInputRtl) TextAlign.Right else TextAlign.Left,
+                                        textDirection = if (isInputRtl) TextDirection.Rtl else TextDirection.Ltr,
+                                    ),
+                                singleLine = false,
+                                maxLines = 8,
+                                cursorBrush = SolidColor(palette.text),
+                                decorationBox = { innerTextField ->
+                                    CompositionLocalProvider(LocalLayoutDirection provides ambientLayoutDirection) {
+                                        Box(
+                                            modifier = Modifier.fillMaxWidth(),
+                                            contentAlignment =
+                                                if (isInputRtl) {
+                                                    Alignment.CenterEnd
+                                                } else {
+                                                    Alignment.CenterStart
+                                                },
+                                        ) {
+                                            CompositionLocalProvider(
+                                                LocalLayoutDirection provides inputLayoutDirection,
+                                            ) {
+                                                if (inputFieldValue.text.isEmpty()) {
+                                                    Text(
+                                                        text = placeholderText,
+                                                        style = MaterialTheme.typography.bodyLarge,
+                                                        textAlign = if (isInputRtl) TextAlign.Right else TextAlign.Left,
+                                                        color = palette.placeholder,
+                                                        maxLines = 1,
+                                                        overflow = TextOverflow.Ellipsis,
+                                                        modifier = Modifier.fillMaxWidth(),
+                                                    )
+                                                }
+                                                innerTextField()
                                             }
-                                            innerTextField()
                                         }
                                     }
-                                }
-                            },
-                        )
+                                },
+                            )
+                        }
                     }
                 }
 
@@ -333,10 +350,15 @@ fun ChatInputBar(
                     onSend = onSend,
                     onQueue = { onBusySend(BusySendMode.QUEUE) },
                     onStopAndSend = { onBusySend(BusySendMode.INTERRUPT) },
+                    canInterrupt = canInterrupt,
+                    onStopGeneration = onStopGeneration,
                     onAttachTap = { showAttachmentTray = !showAttachmentTray },
                     onModelTap = onModelTap,
                     onReasoningSelected = onReasoningTap,
                     onMicTap = onMicTap,
+                    onMicHoldStart = onMicHoldStart,
+                    onMicHoldEnd = onMicHoldEnd,
+                    onMicHoldCancel = onMicHoldCancel,
                     modifier = Modifier.testTag("chat_composer_toolbar"),
                     canDisableReasoning = canDisableReasoning,
                     supportsReasoning = supportsReasoning,

app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatMediaLaunchers.kt

@@ -12,6 +12,9 @@ import android.util.Log
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.State
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -27,6 +30,8 @@ import com.m57.hermescontrol.R
 import com.m57.hermescontrol.data.model.Attachment
 import com.m57.hermescontrol.ui.chat.ChatInputPolicy
 import com.m57.hermescontrol.ui.chat.SpeechInputHelper
+import com.m57.hermescontrol.ui.chat.VoiceNoteRecorder
+import kotlinx.coroutines.delay
 import java.io.File
 import java.text.SimpleDateFormat
 import java.util.Date
@@ -34,10 +39,15 @@ import java.util.Locale
 
 class ChatMediaLaunchers(
     val isListening: Boolean,
+    val isRecordingVoice: Boolean,
+    val voiceNoteAmplitude: State<Float>,
     val onMicTap: () -> Unit,
     val onCameraTap: () -> Unit,
     val onImageTap: () -> Unit,
     val onFileTap: () -> Unit,
+    val onMicHoldStart: () -> Unit = {},
+    val onMicHoldEnd: () -> Unit = {},
+    val onMicHoldCancel: () -> Unit = {},
 )
 
 @Composable
@@ -46,8 +56,10 @@ fun rememberChatMediaLaunchers(
     onInputFieldValueChange: (TextFieldValue) -> Unit,
     onAddAttachment: (uri: String, name: String, mimeType: String, size: Long) -> Unit,
     onAddAttachments: (List<Attachment>) -> Unit,
+    onVoiceNoteRecorded: (file: File) -> Unit,
     onShowMessage: (String) -> Unit,
     launchExternalActivity: (() -> Unit) -> Unit,
+    isTranscribingVoiceNote: Boolean,
     context: Context = LocalContext.current,
 ): ChatMediaLaunchers {
     var isListening by remember { mutableStateOf(false) }
@@ -57,6 +69,7 @@ fun rememberChatMediaLaunchers(
     val currentOnInputFieldValueChange by rememberUpdatedState(onInputFieldValueChange)
     val currentOnAddAttachment by rememberUpdatedState(onAddAttachment)
     val currentOnAddAttachments by rememberUpdatedState(onAddAttachments)
+    val currentOnVoiceNoteRecorded by rememberUpdatedState(onVoiceNoteRecorded)
     val currentOnShowMessage by rememberUpdatedState(onShowMessage)
     val currentLaunchExternalActivity by rememberUpdatedState(launchExternalActivity)
 
@@ -64,6 +77,59 @@ fun rememberChatMediaLaunchers(
     val sttNotAvailableMsg = stringResource(R.string.stt_not_available)
     val sttPermissionDeniedMsg = stringResource(R.string.stt_permission_denied)
     val cameraErrorMsg = stringResource(R.string.chat_camera_error)
+    val voiceRecordFailedMsg = stringResource(R.string.chat_voice_record_failed)
+
+    // Hold-to-record voice note recorder: the clip uploads to the dashboard
+    // for server-side transcription, unlike the flat tap path below, which
+    // still drives the on-device recognizer.
+    val voiceNoteRecorder = remember { VoiceNoteRecorder(context) }
+    var isRecordingVoice by remember { mutableStateOf(false) }
+
+    // Live mic level for the recording panel — rises fast, decays slowly so
+    // the meter reads as voice activity instead of flicker.
+    val voiceNoteAmplitude = remember { mutableStateOf(0f) }
+    LaunchedEffect(Unit) {
+        while (true) {
+            delay(90)
+            val previous = voiceNoteAmplitude.value
+            val next =
+                if (voiceNoteRecorder.isActive) {
+                    maxOf(voiceNoteRecorder.currentAmplitude() / 32767f, previous * 0.8f)
+                } else {
+                    0f
+                }
+            if (next != previous) {
+                voiceNoteAmplitude.value = next
+            }
+        }
+    }
+
+    fun finishVoiceRecording() {
+        val recordedFile = voiceNoteRecorder.stop()
+        isRecordingVoice = false
+        if (recordedFile != null) {
+            currentOnVoiceNoteRecorded(recordedFile)
+        }
+    }
+
+    // App-owned max-duration cap: the timer drives the same
+    // finishVoiceRecording() path as the hold release, so exactly one code
+    // path ever calls stop() — MediaRecorder's own auto-stop used to race
+    // the release and discard a valid max-length clip (review, PR #1250).
+    LaunchedEffect(isRecordingVoice) {
+        if (isRecordingVoice) {
+            delay(VoiceNoteRecorder.MAX_DURATION_MS.toLong())
+            if (voiceNoteRecorder.isActive) {
+                finishVoiceRecording()
+            }
+        }
+    }
+
+    DisposableEffect(voiceNoteRecorder) {
+        onDispose {
+            voiceNoteRecorder.cancel()
+        }
+    }
 
     // Speech-to-text recognition launcher (issue #194)
     val speechLauncher =
@@ -117,6 +183,18 @@ fun rememberChatMediaLaunchers(
             }
         }
 
+    // Hold-to-record permission: unlike the launcher above, granting does NOT
+    // auto-start dictation — the user records by holding the mic again.
+    val voiceNotePermissionLauncher =
+        rememberLauncherForActivityResult(
+            ActivityResultContracts.RequestPermission(),
+        ) { granted ->
+            ExternalActivityLifecycleGuard.externalActivityReturned()
+            if (!granted) {
+                currentOnShowMessage(sttPermissionDeniedMsg)
+            }
+        }
+
     // Multi-file picker for attachments (issue #195)
     val filePickerLauncher =
         rememberLauncherForActivityResult(
@@ -183,7 +261,14 @@ fun rememberChatMediaLaunchers(
         }
 
     val onMicTap: () -> Unit = {
-        if (isListening) {
+        if (isTranscribingVoiceNote) {
+            // Single-flight: a server transcription owns the voice pipeline
+            // until it lands (review, PR #1250).
+        } else if (isRecordingVoice) {
+            // A tap while recording discards the in-flight voice note.
+            voiceNoteRecorder.cancel()
+            isRecordingVoice = false
+        } else if (isListening) {
             isListening = false
         } else if (
             ContextCompat.checkSelfPermission(
@@ -212,6 +297,45 @@ fun rememberChatMediaLaunchers(
         }
     }
 
+    val onMicHoldStart: () -> Unit = {
+        if (isTranscribingVoiceNote) {
+            // Single-flight: no new recording while a transcription runs.
+        } else if (voiceNoteRecorder.isActive || isListening) {
+            // A voice note or a dictation session is already running.
+        } else if (
+            ContextCompat.checkSelfPermission(
+                context,
+                Manifest.permission.RECORD_AUDIO,
+            ) == PackageManager.PERMISSION_GRANTED
+        ) {
+            if (voiceNoteRecorder.start()) {
+                isRecordingVoice = true
+            } else {
+                currentOnShowMessage(voiceRecordFailedMsg)
+            }
+        } else {
+            // The denial message comes from voiceNotePermissionLauncher's
+            // result callback only — showing it here fired it before the
+            // dialog even opened (review, PR #1250).
+            currentLaunchExternalActivity {
+                voiceNotePermissionLauncher.launch(Manifest.permission.RECORD_AUDIO)
+            }
+        }
+    }
+
+    val onMicHoldEnd: () -> Unit = {
+        if (voiceNoteRecorder.isActive) {
+            finishVoiceRecording()
+        }
+    }
+
+    val onMicHoldCancel: () -> Unit = {
+        if (voiceNoteRecorder.isActive) {
+            voiceNoteRecorder.cancel()
+        }
+        isRecordingVoice = false
+    }
+
     val onCameraTap: () -> Unit = {
         try {
             val timeStamp =
@@ -245,13 +369,18 @@ fun rememberChatMediaLaunchers(
         }
     }
 
-    return remember(isListening) {
+    return remember(isListening, isRecordingVoice, isTranscribingVoiceNote) {
         ChatMediaLaunchers(
-            isListening = isListening,
+            isListening = isListening || isRecordingVoice,
+            isRecordingVoice = isRecordingVoice,
+            voiceNoteAmplitude = voiceNoteAmplitude,
             onMicTap = onMicTap,
             onCameraTap = onCameraTap,
             onImageTap = onImageTap,
             onFileTap = onFileTap,
+            onMicHoldStart = onMicHoldStart,
+            onMicHoldEnd = onMicHoldEnd,
+            onMicHoldCancel = onMicHoldCancel,
         )
     }
 }

app/src/main/java/com/m57/hermescontrol/ui/chat/components/ComposerToolbar.kt

@@ -10,6 +10,8 @@ import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.gestures.awaitEachGesture
+import androidx.compose.foundation.gestures.awaitFirstDown
 import androidx.compose.foundation.horizontalScroll
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -51,12 +53,16 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberUpdatedState
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.draw.clipToBounds
 import androidx.compose.ui.draw.scale
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.input.pointer.PointerInputScope
+import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.CustomAccessibilityAction
@@ -67,6 +73,7 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import com.m57.hermescontrol.R
+import kotlinx.coroutines.withTimeoutOrNull
 
 /**
  * Bottom controls row for the chat composer, rendered inside the composer card.
@@ -116,12 +123,50 @@ fun ComposerToolbar(
     reasoningWireLevel: String? = null,
     pendingReasoningLevel: String? = null,
     isSessionReady: Boolean = true,
+    canInterrupt: Boolean = false,
+    onMicHoldStart: () -> Unit = {},
+    onMicHoldEnd: () -> Unit = {},
+    onMicHoldCancel: () -> Unit = {},
+    onStopGeneration: () -> Unit = {},
 ) {
     var showReasoningMenu by remember { mutableStateOf(false) }
     val palette = composerPalette()
     val reasoningDisabledForModel = supportsReasoning == false
     val canDisable = canDisableReasoning
 
+    // Telegram-style voice notes: hold to record, release to send, slide away
+    // to cancel. Both mic controls run the same single pointer loop
+    // (micHoldHandler), which owns the whole press until finger-up — so the
+    // release that submits the note can never be lost between recompositions.
+    val currentIsConnected = rememberUpdatedState(isConnected)
+    val currentShowSend = rememberUpdatedState(showSend)
+    val currentCanInterrupt = rememberUpdatedState(canInterrupt)
+    val currentOnMicHoldStart = rememberUpdatedState(onMicHoldStart)
+    val currentOnMicHoldEnd = rememberUpdatedState(onMicHoldEnd)
+    val currentOnMicHoldCancel = rememberUpdatedState(onMicHoldCancel)
+    val flatMicGesture =
+        Modifier.pointerInput(Unit) {
+            micHoldHandler(
+                isEnabled = {
+                    currentIsConnected.value && currentShowSend.value && !currentCanInterrupt.value
+                },
+                onHoldStart = { currentOnMicHoldStart.value() },
+                onHoldEnd = { currentOnMicHoldEnd.value() },
+                onHoldCancel = { currentOnMicHoldCancel.value() },
+            )
+        }
+    val actionMicGesture =
+        Modifier.pointerInput(Unit) {
+            micHoldHandler(
+                isEnabled = {
+                    currentIsConnected.value && !currentShowSend.value && !currentCanInterrupt.value
+                },
+                onHoldStart = { currentOnMicHoldStart.value() },
+                onHoldEnd = { currentOnMicHoldEnd.value() },
+                onHoldCancel = { currentOnMicHoldCancel.value() },
+            )
+        }
+
     Row(
         modifier =
             modifier
@@ -417,25 +462,47 @@ fun ComposerToolbar(
             }
         }
 
-        // Flat mic / stop button — only while the action button is in send mode
+        // Flat slot — mic while idle; while a generation can be interrupted it
+        // keeps queue-send available (the action button carries Stop). During
+        // session preparation the mic stays here and the action button is a
+        // disabled send: Stop must not appear when there is nothing to
+        // interrupt (review, PR #1250).
         AnimatedVisibility(
             visible = showSend,
             enter = fadeIn() + scaleIn(initialScale = 0.8f),
             exit = fadeOut() + scaleOut(targetScale = 0.8f),
         ) {
-            FilledIconButton(
-                onClick = onMicTap,
-                enabled = isConnected,
-                colors = if (isListening) listeningIconButtonColors() else flatIconButtonColors(palette),
-                modifier =
-                    Modifier
-                        .size(ControlSize)
-                        .testTag(if (isListening) "mic_stop_button" else "mic_button"),
-            ) {
-                Icon(
-                    imageVector = if (isListening) Icons.Default.Stop else Icons.Outlined.Mic,
-                    contentDescription = if (isListening) "Stop listening" else "Mic",
-                )
+            if (canInterrupt) {
+                FilledIconButton(
+                    onClick = onSend,
+                    enabled = canSend,
+                    colors = flatIconButtonColors(palette),
+                    modifier =
+                        Modifier
+                            .size(ControlSize)
+                            .testTag("send_button"),
+                ) {
+                    Icon(
+                        imageVector = Icons.AutoMirrored.Filled.Send,
+                        contentDescription = stringResource(R.string.chat_send_desc),
+                    )
+                }
+            } else {
+                FilledIconButton(
+                    onClick = onMicTap,
+                    enabled = isConnected,
+                    colors = if (isListening) listeningIconButtonColors() else flatIconButtonColors(palette),
+                    modifier =
+                        Modifier
+                            .size(ControlSize)
+                            .testTag(if (isListening) "mic_stop_button" else "mic_button")
+                            .then(flatMicGesture),
+                ) {
+                    Icon(
+                        imageVector = if (isListening) Icons.Default.Stop else Icons.Outlined.Mic,
+                        contentDescription = if (isListening) "Stop listening" else "Mic",
+                    )
+                }
             }
         }
 
@@ -484,21 +551,29 @@ fun ComposerToolbar(
                         }
                     }.combinedClickable(
                         enabled = actionEnabled,
-                        onClick = if (showSend) onSend else onMicTap,
+                        onClick = {
+                            when {
+                                canInterrupt -> onStopGeneration()
+                                showSend -> onSend()
+                                else -> onMicTap()
+                            }
+                        },
                         onLongClick = if (showSend && showQueue) onStopAndSend else null,
                         onLongClickLabel = if (showSend && showQueue) stopAndSendLabel else null,
                     ).testTag(
                         when {
+                            canInterrupt -> "stop_button"
                             showSend -> "send_button"
                             isListening -> "mic_stop_button"
                             else -> "mic_button"
                         },
-                    ),
+                    ).then(if (showSend || canInterrupt) Modifier else actionMicGesture),
             contentAlignment = Alignment.Center,
         ) {
             Crossfade(
                 targetState =
                     when {
+                        canInterrupt -> ActionGlyph.STOP
                         showSend -> ActionGlyph.SEND
                         isListening -> ActionGlyph.STOP
                         else -> ActionGlyph.VOICE
@@ -517,8 +592,18 @@ fun ComposerToolbar(
                     ActionGlyph.STOP -> {
                         Icon(
                             imageVector = Icons.Default.Stop,
-                            contentDescription = "Stop listening",
-                            tint = if (isListening) MaterialTheme.colorScheme.onErrorContainer else palette.onAction,
+                            contentDescription =
+                                if (canInterrupt) {
+                                    stringResource(R.string.chat_voice_stop_generating)
+                                } else {
+                                    "Stop listening"
+                                },
+                            tint =
+                                if (isListening && !canInterrupt) {
+                                    MaterialTheme.colorScheme.onErrorContainer
+                                } else {
+                                    palette.onAction
+                                },
                         )
                     }
 
@@ -632,3 +717,91 @@ fun buildReasoningLabel(
     }
     return reqLabel
 }
+
+/**
+ * Telegram-style mic gesture: press and hold past [HOLD_TO_RECORD_THRESHOLD_MS]
+ * records a voice note, release sends it, and sliding away (left or up) from
+ * the button cancels instead of sending. Short taps use the control's normal
+ * click handler for dictation, so touch and accessibility actions share one
+ * callback path.
+ *
+ * The whole down-to-up sequence lives in this one pointer loop, so the release
+ * that submits can never be lost to a recomposition between press and
+ * finger-up — an earlier interaction-source based approach could lose it and
+ * leave the recorder running until some later tap "sent" the stale clip.
+ */
+private suspend fun PointerInputScope.micHoldHandler(
+    isEnabled: () -> Boolean,
+    onHoldStart: () -> Unit,
+    onHoldEnd: () -> Unit,
+    onHoldCancel: () -> Unit,
+) {
+    val cancelSlop = MIC_SLIDE_CANCEL_DP.dp.toPx()
+    awaitEachGesture {
+        val down = awaitFirstDown(requireUnconsumed = false)
+        if (!isEnabled()) {
+            return@awaitEachGesture
+        }
+
+        fun slidAway(position: Offset): Boolean {
+            val dx = position.x - down.position.x
+            val dy = position.y - down.position.y
+            return dx < -cancelSlop || dy < -cancelSlop
+        }
+
+        // Phase 1 — a finger-up before the threshold is a plain tap.
+        var earlyUp = false
+        var gestureAborted = false
+        withTimeoutOrNull(HOLD_TO_RECORD_THRESHOLD_MS) {
+            while (true) {
+                val event = awaitPointerEvent()
+                val change =
+                    event.changes.firstOrNull { it.id == down.id }
+                        ?: run {
+                            gestureAborted = true
+                            return@withTimeoutOrNull
+                        }
+                if (!change.pressed) {
+                    earlyUp = true
+                    return@withTimeoutOrNull
+                }
+                if (change.isConsumed || slidAway(change.position)) {
+                    gestureAborted = true
+                    return@withTimeoutOrNull
+                }
+            }
+        }
+        if (gestureAborted) {
+            return@awaitEachGesture
+        }
+        if (earlyUp) {
+            return@awaitEachGesture
+        }
+
+        // Phase 2 — the threshold passed with the finger down: record until
+        // the finger lifts (send) or slides away (cancel). No timeout here.
+        onHoldStart()
+        var send = false
+        try {
+            while (true) {
+                val event = awaitPointerEvent()
+                val change = event.changes.firstOrNull { it.id == down.id } ?: break
+                if (!change.pressed) {
+                    send = true
+                    break
+                }
+                if (change.isConsumed || slidAway(change.position)) {
+                    break
+                }
+            }
+        } finally {
+            if (send) onHoldEnd() else onHoldCancel()
+        }
+    }
+}
+
+/** A press shorter than this is a tap; longer arms voice-note recording. */
+private const val HOLD_TO_RECORD_THRESHOLD_MS = 400L
+
+/** Sliding this far from the mic button (left or up) cancels the recording. */
+private const val MIC_SLIDE_CANCEL_DP = 64

app/src/main/java/com/m57/hermescontrol/ui/chat/components/VoiceNoteRecordingPanel.kt

@@ -0,0 +1,128 @@
+package com.m57.hermescontrol.ui.chat.components
+
+import android.os.SystemClock
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.State
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateListOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.snapshotFlow
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import com.m57.hermescontrol.R
+import kotlinx.coroutines.delay
+
+/**
+ * Telegram-style recording strip shown in place of the input field while a
+ * voice note is being recorded: a slide-to-cancel hint, an elapsed timer, and
+ * a live mic level meter so the press and the captured audio are both visible
+ * even when the mic button itself is under the thumb.
+ */
+@Composable
+internal fun VoiceNoteRecordingPanel(
+    amplitude: State<Float>,
+    modifier: Modifier = Modifier,
+) {
+    val palette = composerPalette()
+    var elapsedSeconds by remember { mutableStateOf(0L) }
+    LaunchedEffect(Unit) {
+        val startedAt = SystemClock.elapsedRealtime()
+        while (true) {
+            elapsedSeconds = (SystemClock.elapsedRealtime() - startedAt) / 1000
+            delay(200)
+        }
+    }
+    val levels = remember { mutableStateListOf<Float>() }
+    LaunchedEffect(Unit) {
+        snapshotFlow { amplitude.value }.collect { level ->
+            levels.add(level)
+            while (levels.size > VOICE_NOTE_BARS) {
+                levels.removeAt(0)
+            }
+        }
+    }
+    Row(
+        modifier =
+            modifier
+                .heightIn(min = 42.dp)
+                .testTag("voice_note_recording_panel"),
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.spacedBy(10.dp),
+    ) {
+        Icon(
+            imageVector = Icons.AutoMirrored.Filled.ArrowBack,
+            // Decorative: the adjacent "Slide to cancel" text carries the
+            // instruction, so the arrow must not repeat it (review, PR #1250).
+            contentDescription = null,
+            tint = palette.placeholder,
+            modifier = Modifier.size(16.dp),
+        )
+        Text(
+            text = stringResource(R.string.chat_voice_slide_to_cancel),
+            style = MaterialTheme.typography.labelMedium,
+            color = palette.placeholder,
+            maxLines = 1,
+        )
+        Spacer(modifier = Modifier.weight(1f))
+        Box(
+            modifier =
+                Modifier
+                    .size(8.dp)
+                    .background(MaterialTheme.colorScheme.error, CircleShape),
+        )
+        Text(
+            text = formatElapsed(elapsedSeconds),
+            style = MaterialTheme.typography.labelLarge,
+            color = palette.text,
+        )
+        Row(
+            modifier = Modifier.height(24.dp),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(2.dp),
+        ) {
+            val filler = VOICE_NOTE_BARS - levels.size
+            repeat(VOICE_NOTE_BARS) { index ->
+                val level = if (index < filler) 0f else levels[index - filler]
+                Box(
+                    modifier =
+                        Modifier
+                            .width(3.dp)
+                            .height((4f + 18f * level).dp)
+                            .background(palette.placeholder, RoundedCornerShape(2.dp)),
+                )
+            }
+        }
+    }
+}
+
+/** Number of level-meter bars in the recording panel. */
+private const val VOICE_NOTE_BARS = 14
+
+/** Formats elapsed recording time as m:ss. */
+private fun formatElapsed(seconds: Long): String {
+    val minutes = seconds / 60
+    val secs = seconds % 60
+    return "$minutes:${secs.toString().padStart(2, '0')}"
+}