Winamp IPC_GETPLAYLISTTITLE returns ANSI (char*) strings in its process
memory. Blindly casting bytes to string garbles umlauts and other non-ASCII
chars. Fix: decode via MultiByteToWideChar(CP_ACP) → UTF-16 → Go string,
using the same code page Windows uses for the title.

Also check ReadProcessMemory return value — failures now return empty
string instead of garbage.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>