Fix real bugs found by clang-tidy

- game_handler.cpp: use-after-move on node.id after std::move(node)
  (save nodeId before the move)
- tcp_socket.cpp, world_socket.cpp: virtual call in destructor bypasses
  dispatch; use qualified TCPSocket::disconnect() / WorldSocket::disconnect()
  to make intent explicit
- wmo_renderer.cpp: float loop counters risk precision drift; replace with
  integer step counts and reconstruct float from index
- game_screen.cpp: (float + 0.5) cast to int is incorrect rounding;
  use std::lround instead

src/network/tcp_socket.cpp

@@ -11,7 +11,7 @@ TCPSocket::TCPSocket() {
 }
 
 TCPSocket::~TCPSocket() {
-    disconnect();
+    TCPSocket::disconnect();  // qualified call: virtual dispatch is bypassed in destructors
 }
 
 bool TCPSocket::connect(const std::string& host, uint16_t port) {