feat(rust): manage Linux Spotify updates from the client

[afonsojramos]

Summary

Managed Linux Spotify installations can now update from inside the client, with progress and recovery owned by the daemon. The same transaction keeps terminal and desktop launches on the selected installation.

This completes the client integration for the Linux installer. Updates use Spotify's official package feed and require an exact verified classmap. The candidate is patched before activation; a failed activation restores the previous configuration and launchers. Reinstall keeps the selected channel, and the daemon follows changes to the installation directory.

Native updater protection remains a separate fact. An unknown block state is omitted from the manifest instead of being reported as unblocked. A version probe no longer counts as a running Spotify client during launch verification.

The workspace version advances to 3.0.0-beta.18. Abrupt daemon termination is reported as an interrupted job with a reinstall command; automatic rollback covers normal activation failures.

Related: #3950

Validation

• Live Manager-driven upgrade from a retained Spotify 1.2.84 fixture to the official 1.2.96 package; patched first boot and both launchers verified.
• Injected candidate launch failure: readable progress, failed job, restored configuration and launchers, previous client restarted.
• Duplicate admission joined the running job; unauthenticated requests, shutdown during update, and competing CLI operations were rejected.
• After integrating current upstream fixes: 166 Rust tests passed, 3 ignored; Clippy and payload tests passed.

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