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/game/game_handler.cpp

@@ -9513,10 +9513,11 @@ void GameHandler::loadTaxiDbc() {
                     node.mountDisplayIdHorde = nodesDbc->getUInt32(i, mountHordeFB);
                 }
             }
-            if (node.id > 0) {
-                taxiNodes_[node.id] = std::move(node);
+            uint32_t nodeId = node.id;
+            if (nodeId > 0) {
+                taxiNodes_[nodeId] = std::move(node);
             }
-            if (node.id == 195) {
+            if (nodeId == 195) {
                 std::string fields;
                 for (uint32_t f = 0; f < fieldCount; f++) {
                     fields += std::to_string(f) + ":" + std::to_string(nodesDbc->getUInt32(i, f)) + " ";