fix(android): populate streamUrl in CachedTrackEntity to domain mapper

CachedTrackEntity.toDomain() was emitting TrackRef.streamUrl="" (the
default). Tracks routed through MetadataProvider (the Home cache
hydration path used by Most Played) inherited the empty string;
player.setQueue() then got a queue of unplayable tracks.

The server's stream_url is deterministic per track id
(internal/api/convert.go:75 streamURL builder), so the cache mapper
can reconstruct it from the row's id without storing it in Room.
TrackWire.toDomain() continues to use the wire-provided value
(identical content).

Operator reported "tap to play wiring in Most Played queues content
that can't play" on 2026-06-01. The Most Played multi-row layout
itself isn't the cause - the same gap affected the single-row
layout - but the denser display made the dead taps more obvious.

android/app/src/main/java/com/fabledsword/minstrel/library/data/LibraryMappers.kt

@@ -97,6 +97,12 @@ fun CachedTrackEntity.toDomain(
         trackNumber = trackNumber,
         discNumber = discNumber,
         durationSec = durationMs.millisToSeconds(),
+        // Deterministic from track id; matches the server's stream_url
+        // (internal/api/convert.go:75 streamURL builder). Cached rows
+        // didn't carry streamUrl before, which left MetadataProvider-
+        // sourced tracks (Home Most Played, etc.) unplayable when their
+        // queue was set on tap.
+        streamUrl = "/api/tracks/$id/stream",
     )
 
 // Wire to Domain — for fresh server responses that bypass the cache