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

src/routing_layer/topo_node.c

@@ -107,6 +107,8 @@ struct TOPO_NODE* topo_node_registry_store(struct TOPO_GROUPS* groups, struct TO
     struct TOPO_NODE* existing = topo_node_registry_find(groups, ni->node_id);
     if (existing) {
         topo_node_ref(existing);
+        if (!existing->v4_addrs && ni->v4_addrs) { existing->v4_addrs = ni->v4_addrs; ni->v4_addrs = NULL; }
+        if (!existing->v6_addrs && ni->v6_addrs) { existing->v6_addrs = ni->v6_addrs; ni->v6_addrs = NULL; }
         topo_node_free_raw(groups, ni);
         return existing;
     }