fix: voice playback coordinate bug + debug logging + device name encoding

- messagedelegate: editorEvent now adjusts me->pos() by option.rect.topLeft()
- voiceplayback: enhanced debug logging for file open/decode/play
- messagelist: debug voice file path + exists check
- inputbar: debug mediaDir path on record
- sound_manager: debug in playRawPcm, decodeDeviceName() for mixed encodings
- voiceencoder: debug file write path

tools/chatgui/src/voiceplayback.cpp

@@ -13,10 +13,15 @@ static const uint32_t OPUS_MAGIC = 0x5355504F;
 int VoicePlayer::decodeOpusFile(const QString& filePath, std::vector<int16_t>& outPcm,
                                  int& outSampleRate, int& outChannels, float& outDurationSec) {
     QFile file(filePath);
-    if (!file.open(QIODevice::ReadOnly)) {
-        qWarning("VoicePlayer: cannot open %s", qPrintable(filePath));
+    if (!file.exists()) {
+        qWarning("VoicePlayer: file not found: %s", qPrintable(filePath));
         return -1;
     }
+    if (!file.open(QIODevice::ReadOnly)) {
+        qWarning("VoicePlayer: cannot open %s (%s)", qPrintable(filePath), qPrintable(file.errorString()));
+        return -1;
+    }
+    qDebug("VoicePlayer: opened file %s size=%lld", qPrintable(filePath), (long long)file.size());
 
     uint32_t magic, sr32;
     uint16_t ch16, frameSamples;
@@ -68,11 +73,17 @@ int VoicePlayer::decodeOpusFile(const QString& filePath, std::vector<int16_t>& o
 }
 
 void VoicePlayer::playOpusFile(const QString& filePath) {
+    qDebug("VoicePlayer::playOpusFile: %s", qPrintable(filePath));
     std::vector<int16_t> pcm;
     int sampleRate, channels;
     float duration;
 
-    if (decodeOpusFile(filePath, pcm, sampleRate, channels, duration) <= 0) return;
+    if (decodeOpusFile(filePath, pcm, sampleRate, channels, duration) <= 0) {
+        qWarning("VoicePlayer::playOpusFile: decode failed for %s", qPrintable(filePath));
+        return;
+    }
 
+    qDebug("VoicePlayer::playOpusFile: decoded %zu samples %dHz %dch %.1fs → playing",
+           pcm.size(), sampleRate, channels, duration);
     SoundManager::instance()->playRawPcm(pcm.data(), pcm.size() / channels, sampleRate, channels);
 }