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/accountdelegate.cpp

@@ -35,6 +35,7 @@ void AccountDelegate::paint(QPainter *painter, const QStyleOptionViewItem &optio
 
     QColor textColor = option.palette.color(QPalette::Text);
     if (option.state & QStyle::State_Selected) textColor = option.palette.color(QPalette::HighlightedText);
+    if (index.data(Qt::UserRole + 2).toBool()) textColor = QColor("#4CAF50");
     painter->setPen(textColor);
 
     QString name = index.data(Qt::DisplayRole).toString();