feat(music): configurable in-track seek via an mpv control socket

The subprocess player I just switched to dropped in-track seek. I re-added it without the startup fragility that made the IPC player unreliable. mpv still plays the track as a direct argument, so the reliable start is untouched, and --input-ipc-server opens a control socket that only carries seek commands to the already-playing process. f and b seek by cj/music-seek-seconds (default 5). The socket send is a no-op when nothing is playing, so it never errors.

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