Migrate music keybindings and scripts from xmms2 to mpv

[cwage]

The awesomewm keybindings and helper scripts reference xmms2 commands that need to be updated for mpv with IPC socket control.

Keybindings (rc.lua:392-396)

Key	Current (xmms2)	New (mpv via socat)
mod+\	xmms2 toggle	echo '{"command":["cycle","pause"]}' | socat - /tmp/mpv-socket
mod+'	randomalbum.sh	Already updated — works as-is
mod+;	nowplaying.sh	Needs rewrite to query mpv socket
mod+[	xmms2 prev	echo '{"command":["playlist-prev"]}' | socat - /tmp/mpv-socket
mod+]	xmms2 next	echo '{"command":["playlist-next"]}' | socat - /tmp/mpv-socket

Scripts to update

• ~/bin/randomalbum.sh — already updated to use mpv with IPC socket
• ~/bin/nowplaying.sh — needs rewrite to query media-title from mpv socket
• Consider small wrapper scripts (e.g. ~/bin/music-toggle.sh) instead of inline socat in rc.lua

Notes

• mpv IPC socket at /tmp/mpv-socket (set by --input-ipc-server in randomalbum.sh)
• socat is already installed on the system
• Can also remove mpd config (~/.config/mpd) from Home Manager since we're not using it