Audio Alerts & Config Files

changes

• audio player, the timer can make noise now. via native OS tools instead of pulling in an audio library: PulseAudio/PipeWire/ALSA on Linux, afplay on macOS, PlaySoundW on Windows.
• config system, added a simple key=value config format with a custom parser. nothing fancy, but it works!:D
• cleanup, nothing exciting just tidying up…

p.s everything here is my own tiny (and maybe terrible) code, no imported libraries. this project’s stayed dependency-less-ish from the start, it leans on existing system-level stuff (libnotify, whatever audio server you’ve got on Linux, etc) instead of bundling in external libs :D