Socket fixes (fixes Windows-only connection failure):
- WorldSocket::connect() now waits for non-blocking connect to complete with
select() before returning, preventing WSAENOTCONN on the first recv() call
on Windows (Linux handles this implicitly but Windows requires writability
poll after non-blocking connect)
- Add net::isConnectionClosed() helper: treats WSAENOTCONN/WSAECONNRESET/
WSAESHUTDOWN/WSAECONNABORTED as graceful peer-close rather than recv errors
- Apply isConnectionClosed() in both WorldSocket and TCPSocket recv loops
UI:
- Add renderBossFrames(): displays boss unit health bars in top-right corner
when SMSG_UPDATE_INSTANCE_ENCOUNTER_UNIT has active slots; supports
click-to-target and color-coded health bars (red→orange→yellow as HP drops)
- net_platform.hpp: guard ssize_t typedef with !__MINGW32__ since MinGW-w64
already defines ssize_t as __int64 in corecrt.h
- logger.hpp: push/pop ERROR macro around LogLevel enum (same wingdi.h clash
as world_packets.hpp)
Replace POSIX-specific socket and process APIs with portable
abstractions so the project builds on both Windows and Linux.
- Add include/network/net_platform.hpp: Winsock2/POSIX socket
abstraction (socket types, non-blocking, error handling,
WSAStartup lifecycle)
- Add include/platform/process.hpp: CreateProcess/fork+exec
abstraction for spawning ffplay subprocesses
- Update network module (tcp_socket, world_socket) to use
portable socket helpers instead of raw POSIX calls
- Update audio module (music_manager, footstep_manager,
activity_sound_manager) to use portable process helpers
instead of fork/exec/kill/waitpid
- Replace hardcoded /tmp/ paths with std::filesystem::temp_directory_path()
- Link ws2_32 and SDL2main on Windows in CMakeLists.txt
