android: member list screen + link status dots, ipv6 autoconnect fixes

Android chatgui:
- New MemberListScreen with member list, detail card, edit dialog
- Link status dots (green/red/grey) per address in detail card (1s poll)
- Self-node name coloured green
- ChatScreen: people icon in TopAppBar

IPv6 autoconnect fixes (3 bugs in conn_mgr/topo):
- topo_node_sqlite_node_load: load v6 addresses from DB
- topo_node_registry_store: merge v6_addrs into existing node
- cm_sock_v6_classify: wildcard [::] treated as CM_V6_DIR
- cm_add_v6_link: htons(port) was missing

Memory fixes:
- strdup→u_strdup in bridge (7 instances)
- u_realloc cap update before success check (3 instances)
- char sql[256]→[512] for truncated SELECT

Chat member hash now includes addresses for change detection

Linux chatgui:
- Link status dots in AccountList detail panel (1s poll)
- Self-node name in green in member list

tools/chatgui/src/accountlist.cpp

@@ -10,6 +10,13 @@
 #include <QFont>
 #include "../../../lib/platform_compat.h"
 
+extern "C" {
+    #include "utun_instance.h"
+    #include "etcp.h"
+    #include "etcp_connections.h"
+    #include "../lib/socket_compat.h"
+}
+
 QString AccountList::addrStr(const void* addr, int family) {
     if (family == 4) {
         const uint8_t* a = (const uint8_t*)addr;
@@ -84,12 +91,19 @@ AccountList::AccountList(DbManager* db, QWidget *parent)
     m_detailTimer = new QTimer(this);
     m_detailTimer->setInterval(5000);
     connect(m_detailTimer, &QTimer::timeout, this, &AccountList::onDetailTimerTick);
+
+    m_linkTimer = new QTimer(this);
+    m_linkTimer->setInterval(1000);
+    connect(m_linkTimer, &QTimer::timeout, this, [this]{
+        if (m_detailNodeId != 0) updateDetailDisplay();
+    });
 }
 
 void AccountList::setChannel(const QString& channelId) {
     m_channelId = channelId;
     m_model->setChannel(channelId);
     m_detailTimer->stop();
+    m_linkTimer->stop();
     m_detailNodeId = 0;
     m_detailText->clear();
 }
@@ -106,6 +120,7 @@ void AccountList::showMemberDetail(quint64 nodeId) {
     if (!m_db || !m_db->m_db) return;
 
     m_detailTimer->stop();
+    m_linkTimer->stop();
     m_detailNodeId = nodeId;
     m_detailName.clear();
     m_detailOnline = false;
@@ -166,6 +181,7 @@ void AccountList::showMemberDetail(quint64 nodeId) {
     }
 
     m_detailTimer->start();
+    m_linkTimer->start();
     updateDetailDisplay();
 }
 
@@ -184,10 +200,35 @@ void AccountList::updateDetailDisplay() {
     if (m_detailCreated > 0)
         lines.append(QString("📅 %1").arg(relativeTimeStr(m_detailCreated)));
 
+    struct ETCP_CONN* conn = nullptr;
+    if (m_inst) conn = instance_find_conn(m_inst, m_detailNodeId);
+
     for (const auto& a : m_detailAddrs) {
         QString proto;
         switch (a.protocol) { case 1: proto = "UDP"; break; case 2: proto = "TCP"; break; default: proto = "UDP/TCP"; break; }
-        lines.append(QString("%1:%2:%3").arg(proto, addrStr(a.addr.constData(), a.family)).arg(a.port));
+        QString linkColor = "#9E9E9E";
+        if (conn) {
+            for (struct ETCP_LINK* lk = conn->links; lk; lk = lk->next) {
+                const struct sockaddr_storage* sa = &lk->remote_addr;
+                int lfm = 0; QString lip; uint16_t lpo = 0;
+                char ipbuf[INET6_ADDRSTRLEN];
+                if (sa->ss_family == AF_INET) {
+                    struct sockaddr_in* sin = (struct sockaddr_in*)sa;
+                    inet_ntop(AF_INET, &sin->sin_addr, ipbuf, sizeof(ipbuf));
+                    lfm = 4; lpo = ntohs(sin->sin_port); lip = QString::fromLocal8Bit(ipbuf);
+                } else if (sa->ss_family == AF_INET6) {
+                    struct sockaddr_in6* sin6 = (struct sockaddr_in6*)sa;
+                    inet_ntop(AF_INET6, &sin6->sin6_addr, ipbuf, sizeof(ipbuf));
+                    lfm = 6; lpo = ntohs(sin6->sin6_port); lip = QString::fromLocal8Bit(ipbuf);
+                }
+                if (lfm == a.family && lpo == (uint16_t)a.port && lip == addrStr(a.addr.constData(), a.family)) {
+                    linkColor = (lk->link_state == 3 && lk->link_status == 1) ? "#4CAF50" : "#E53935";
+                    break;
+                }
+            }
+        }
+        lines.append(QString("<span style='color:%1;'>●</span> %2:%3:%4")
+                     .arg(linkColor, proto, addrStr(a.addr.constData(), a.family)).arg(a.port));
     }
 
     m_detailText->setHtml(lines.join("<br>"));