Deezy v0.2.15

Fixed

• True pause/cancel semantics for downloads – Pausing a download now triggers real backend cancellation instead of UI-only state changes, and resume only requeues work that was genuinely canceled.
• Partial-file cleanup and duplicate churn – Downloads now write to an in-progress temp file and only finalize to the target filename on successful completion; temp/partial files are cleaned up on failure or cancellation.
• Backend request lock contention – Search and metadata command handlers no longer hold the shared client mutex across awaited network calls, reducing unnecessary request serialization and latency spikes.
• Deezer URL validation hardening – URL parsing now validates scheme/host/path shape explicitly, and frontend URL handling relies on backend canonical validation messages.
• Tray listener lifecycle leak – Tray manager now keeps and disposes all store subscription unsubscribers during destroy, preventing duplicate updates after re-initialization.
• Out-of-order search result races – Search UI now uses a request-token guard so stale responses cannot overwrite newer query results.