fix(android): split wire types — one declaration per file

Hypothesis for the KSP2 "LibraryApi could not be resolved" failure:
ArtistWire.kt and AlbumWire.kt each declared TWO @Serializable
classes (the Ref and the Detail variant). LibraryApi imports the
Detail variants but the file names match the Ref variants. KSP2's
symbol indexing may key on `className.kt` and fail to surface the
second declaration in a multi-class file.

Splitting per the MatchingDeclarationName convention:
  - ArtistDetailWire.kt (new)
  - AlbumDetailWire.kt (new)
  - ArtistWire.kt / AlbumWire.kt now contain only their namesake type

If this fixes it, the LibraryApi resolution will work without
changing the @Provides signature.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/app/src/main/java/com/fabledsword/minstrel/models/wire/AlbumDetailWire.kt

@@ -0,0 +1,22 @@
+package com.fabledsword.minstrel.models.wire
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+/**
+ * Wire shape for `GET /api/albums/{id}` — server returns AlbumRef
+ * fields PLUS an embedded `tracks` array.
+ */
+@Serializable
+data class AlbumDetailWire(
+    val id: String,
+    val title: String,
+    @SerialName("artist_id") val artistId: String,
+    @SerialName("sort_title") val sortTitle: String = "",
+    @SerialName("artist_name") val artistName: String = "",
+    val year: Int? = null,
+    @SerialName("track_count") val trackCount: Int = 0,
+    @SerialName("duration_sec") val durationSec: Int = 0,
+    @SerialName("cover_url") val coverUrl: String = "",
+    val tracks: List<TrackWire> = emptyList(),
+)

android/app/src/main/java/com/fabledsword/minstrel/models/wire/AlbumWire.kt

@@ -18,21 +18,3 @@ data class AlbumWire(
     @SerialName("duration_sec") val durationSec: Int = 0,
     @SerialName("cover_url") val coverUrl: String = "",
 )
-
-/**
- * Wire shape for `GET /api/albums/{id}` — server returns AlbumRef
- * fields PLUS an embedded `tracks` array.
- */
-@Serializable
-data class AlbumDetailWire(
-    val id: String,
-    val title: String,
-    @SerialName("artist_id") val artistId: String,
-    @SerialName("sort_title") val sortTitle: String = "",
-    @SerialName("artist_name") val artistName: String = "",
-    val year: Int? = null,
-    @SerialName("track_count") val trackCount: Int = 0,
-    @SerialName("duration_sec") val durationSec: Int = 0,
-    @SerialName("cover_url") val coverUrl: String = "",
-    val tracks: List<TrackWire> = emptyList(),
-)

android/app/src/main/java/com/fabledsword/minstrel/models/wire/ArtistDetailWire.kt

@@ -0,0 +1,18 @@
+package com.fabledsword.minstrel.models.wire
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+/**
+ * Wire shape for `GET /api/artists/{id}` — server returns ArtistRef
+ * fields PLUS an embedded `albums` array.
+ */
+@Serializable
+data class ArtistDetailWire(
+    val id: String,
+    val name: String,
+    @SerialName("sort_name") val sortName: String = "",
+    @SerialName("album_count") val albumCount: Int = 0,
+    @SerialName("cover_url") val coverUrl: String = "",
+    val albums: List<AlbumWire> = emptyList(),
+)

android/app/src/main/java/com/fabledsword/minstrel/models/wire/ArtistWire.kt

@@ -14,20 +14,3 @@ data class ArtistWire(
     @SerialName("album_count") val albumCount: Int = 0,
     @SerialName("cover_url") val coverUrl: String = "",
 )
-
-/**
- * Wire shape for `GET /api/artists/{id}` — server returns ArtistRef
- * fields PLUS an embedded `albums` array. We can't directly map this
- * to ArtistWire because Retrofit/kotlinx.serialization doesn't support
- * a single record being two types; an explicit DetailWire spells out
- * both halves and the repository handles the split.
- */
-@Serializable
-data class ArtistDetailWire(
-    val id: String,
-    val name: String,
-    @SerialName("sort_name") val sortName: String = "",
-    @SerialName("album_count") val albumCount: Int = 0,
-    @SerialName("cover_url") val coverUrl: String = "",
-    val albums: List<AlbumWire> = emptyList(),
-)