* fix(playback): pin queue streams, cover art, and library links to queue server
When the active server changes while a queue from another server is playing,
keep streams and UI on queueServerId; switch back for artist/album links and
queue or player-bar context menus.
* fix(playback): switch to queue server when opening Now Playing
Ensure active server matches queueServerId before Subsonic fetches on the
Now Playing page, mobile player route, and queue info panel; scope caches
by server id.
* docs(credits): mention Now Playing in PR #717 contribution line
* fix(playback): route scrobble and queue sync to queue server
Address PR review: apiForServer for scrobble/now-playing/savePlayQueue,
clear queueServerId on server removal, mini-player queueServerId sync,
block cross-server enqueue with toast, and regression tests.
cucadmuh