fix: RMS mic level, 25ms timer, speaker test, overlay recording indicator

- AudioRecorder: peak replaced with RMS (sqrt mean of squares)
- AudioDeviceSettings: level meter timer 100ms -> 25ms
- SoundManager: playRawPcm uses ma_audio_buffer_ref instead of ma_decoder (fixes speaker test)
- InputBar: recording overlay positioned over text input, no layout shift
- messagelist: removed old recording indicator widget

tools/chatgui/src/inputbar.cpp

@@ -1,5 +1,7 @@
 #include "inputbar.h"
 #include "emojipanel.h"
+#include "audiorecorder.h"
+#include "voicemessageencoder.h"
 #include "debug_ui.h"
 #include <QDebug>
 #include <QTextEdit>
@@ -11,6 +13,8 @@
 #include <QFontMetrics>
 #include <QScrollBar>
 #include <QApplication>
+#include <QLabel>
+#include <QResizeEvent>
 
 static QPushButton *makeIconBtn(const QString &text, const QString &tooltip, QWidget *parent) {
     auto *btn = new QPushButton(text, parent);
@@ -99,6 +103,33 @@ InputBar::InputBar(EmojiPanel *emojiPanel, AudioRecorder *recorder, QWidget *par
             m_input->setFocus();
         });
     }
+
+    /* Recording overlay — appears over the text input during recording */
+    m_recordOverlay = new QWidget(this);
+    m_recordOverlay->setStyleSheet("background: rgba(231, 76, 60, 0.88); border-radius: 6px;");
+    m_recordOverlay->hide();
+    auto* roLayout = new QHBoxLayout(m_recordOverlay);
+    roLayout->setContentsMargins(12, 0, 8, 0);
+    roLayout->setSpacing(6);
+    m_recordLabel = new QLabel(m_recordOverlay);
+    m_recordLabel->setStyleSheet("color: white; font-size: 14px; font-weight: bold; background: transparent;");
+    roLayout->addWidget(m_recordLabel);
+    roLayout->addStretch();
+    m_cancelRecBtn = new QPushButton(QString::fromUtf8("\xE2\x9C\x95"), m_recordOverlay);
+    m_cancelRecBtn->setFixedSize(24, 24);
+    m_cancelRecBtn->setStyleSheet(
+        "QPushButton { border: none; color: white; font-size: 16px; background: transparent; }"
+        "QPushButton:hover { color: #fdd; }");
+    connect(m_cancelRecBtn, &QPushButton::clicked, this, [this]() {
+        if (m_recorder && m_recorder->isRecording()) m_recorder->stopRecording();
+    });
+    roLayout->addWidget(m_cancelRecBtn);
+
+    if (recorder) {
+        connect(recorder, &AudioRecorder::recordingStarted, this, &InputBar::showRecordOverlay);
+        connect(recorder, &AudioRecorder::recordingStopped, this, [this](int) { hideRecordOverlay(); });
+        connect(recorder, &AudioRecorder::durationChanged, this, &InputBar::updateRecordingUI);
+    }
 }
 
 bool InputBar::eventFilter(QObject *obj, QEvent *event) {
@@ -151,9 +182,6 @@ void InputBar::onSendClicked() {
     m_input->setFocus();
 }
 
-#include "audiorecorder.h"
-#include "voicemessageencoder.h"
-
 void InputBar::setRecordingContext(const QString& mediaDirBase, const QString& channelId) {
     m_mediaDirBase = mediaDirBase;
     m_channelIdForRecord = channelId;
@@ -197,3 +225,34 @@ void InputBar::onPttReleased() {
         emit sendVoiceMessage(filePath, durationMs);
     }
 }
+
+void InputBar::resizeEvent(QResizeEvent* event) {
+    QWidget::resizeEvent(event);
+    if (m_recordOverlay) {
+        QRect r = m_input->geometry();
+        int margin = 4;
+        m_recordOverlay->setGeometry(r.adjusted(margin, margin, -margin, -margin));
+        m_recordOverlay->raise();
+    }
+}
+
+void InputBar::showRecordOverlay() {
+    if (m_recordOverlay) {
+        m_recordOverlay->setGeometry(m_input->geometry().adjusted(4, 4, -4, -4));
+        m_recordOverlay->show();
+        m_recordOverlay->raise();
+        m_recordLabel->setText(QString::fromUtf8("\xF0\x9F\x94\xB4 Recording 0:00"));
+    }
+}
+
+void InputBar::hideRecordOverlay() {
+    if (m_recordOverlay) m_recordOverlay->hide();
+}
+
+void InputBar::updateRecordingUI(int ms) {
+    if (m_recordLabel) {
+        int secs = ms / 1000;
+        m_recordLabel->setText(QString::fromUtf8("\xF0\x9F\x94\xB4 Recording %1:%2")
+            .arg(secs / 60).arg(secs % 60, 2, 10, QChar('0')));
+    }
+}