fix(chat): node online status race, WELCOME peer_needed off-by-one, JOIN missing proto byte

- node_put/node_update_verified: set online=1 on INSERT (nodes created when conn is UP)
- channel_peers_all: fix peer_needed calculation (atl byte was missing)
- cs_send_channel_join: add proto byte to address serialization matching all parsers

tools/chatgui/src/messagedelegate.cpp

@@ -1186,3 +1186,22 @@ void MessageDelegate::drawAvatar(QPainter *p, const Layout &L,
     p->drawPixmap(L.avatarRect, av);
     p->restore();
 }
+
+void MessageDelegate::startAutoPlay(const QString& filePath, float durationSec) {
+    ensureVoiceTimer();
+    VoicePlayState& st = s_voiceStates[filePath];
+    st.playing = true;
+    st.paused = false;
+    st.durationSec = (durationSec > 0) ? durationSec : 1.0f;
+    st.startMs = QDateTime::currentMSecsSinceEpoch();
+    st.pausedPosSec = 0.0f;
+    st.displayFrac = 0.0f;
+    st.displayElapsed = 0.0f;
+    s_voiceTimer->start();
+    if (s_voiceView) s_voiceView->viewport()->update();
+}
+
+void MessageDelegate::stopAllAutoPlay() {
+    for (auto it = s_voiceStates.begin(); it != s_voiceStates.end(); ++it)
+        it->playing = false;
+}