Coalescing library-change frames could lose libraries: a frame that could
not name its libraries (whole server) merged with a frame naming {A} flushed
as {A}, and an event naming physical Jellyfin folders where only some
resolved to a loaded library bumped the resolved one and silently skipped the
grouped view the rest belonged to.
Whole-server scope is now absorbing in the socket's pending window, and the
provider widens to every library on the server whenever any named id fails
to resolve; a fully resolved id set stays precise.
edde746
deeec6810d