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Device verification of v2026.07.15 found the notification/lock-screen next+prev buttons dead during a UPnP cast (play/pause worked). Root cause: the system media controls issue COMMAND_SEEK_TO_NEXT / COMMAND_SEEK_TO_PREVIOUS -> Player.seekToNext()/seekToPrevious(), which are DISTINCT from the seekToNextMediaItem()/seekToPreviousMediaItem() the in-app buttons call and which MinstrelForwardingPlayer already routes to Sonos. seekToNext/Previous were un-overridden, so ForwardingPlayer forwarded them to the paused local delegate — nudging its cursor, which the identity poll then re-synced back to Sonos, so the buttons read as dead. Override seekToNext()/seekToPrevious() to delegate to the media-item variants (the full Sonos path: optimistic local advance + AVTransport Next/Previous + pending-transport gate) when a UPnP route is engaged; plain local playback keeps the default behaviour. Fixes notification/lock-screen/Auto/Wear skip during a cast. Completes milestone #171 Step 3 (#1606 / #606). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>