Add CLI commands for stop, shuffle, repeat, mute, star, rating, reload,
server list/switch, and Subsonic search; publish extra snapshot fields and
server/search JSON for tooling. Single `play <id>` resolves track, album,
or artist; artists play a shuffled full discography.
Guard Linux tray creation with catch_unwind when Ayatana/AppIndicator .so
is missing. Harden bash completion against zsh sourcing (compopt). Narrow
AudioEngine field visibility to silence private_interfaces warnings.
Embed bash and zsh completion scripts and add a `completions` subcommand.
Extend the player CLI (library, audio device, instant mix) and surface
`music_library` in snapshots. Add a shared active-server switcher in the
header and locales; instant mix can reseed the queue from CLI and UI.
Maxim Isaev