Library rows offer the newest waiting episode, and the car sorts like the phone

Three things Peter reported about the podcast list.

**A slow-drip show sorted on episodes it was hiding.** The library's count and
its sort key were computed from every unplayed, unqueued episode, released or
not, so New Yorker Fiction ranked near the top on a brand-new episode drip had
not handed out yet -- a show with nothing visible sitting above shows with
something to hear. Both halves now apply the same released-set the show screen
shows. The count was wrong in the same way and for the same reason, so it moves
with it.

**The row now names the one episode you would actually play**, under the show's
name and in a quieter style, with the same Play, Queue and Download controls the
episode list offers. The show stays the focus: this is a list of shows, and an
episode offering different actions depending on which screen you found it on
would be two features wearing one name. `observeNewestWaiting` sits beside
`observeAll` because the two must agree on what "waiting" means -- a row that
offered an episode the count excludes would be offering something the show
claims not to have.

**Android Auto lists shows in the library's order now.** It was sorted, but
alphabetically, which is a different order from the phone's and so reads as no
order at all. `getBrowsable` is gone rather than reordered: the callback reads
`observeAll` directly, so there is one definition of what the library contains
and what order it is in, and the car cannot drift from the phone again.
Alphabetical was also wrong on its own merits -- the car hides played episodes,
so a show you are caught up on browses as an empty list, and burying the ones
with something to hear among them is exactly what a driver can do nothing about
at a traffic light.

Pinned by `MediaBrowseTest.theCarListsShowsNewestWaitingFirst`, which walks the
real session protocol and failed on alphabetical order before the change, five
new drip cases and five newest-waiting cases in `LibraryOrderTest` against a
real database, and `LibraryRowTest`, which drives the row as a composable
because a row offering the wrong episode's controls looks exactly like one
offering the right episode's.

`LibraryScreen.kt` split rather than relaxing detekt again, same call as
`Screens.kt`: the row and its parts are now `SubscriptionRow.kt`.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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