feat(android): Library Compose screens + Coil OkHttp sharing + Lucide (M8 phase 5.4)

First user-visible UI. LibraryScreen renders the LibraryViewModel
UiState into horizontally-scrolling Artist / Album rows; Loading
shows a centered spinner, Empty / Error fall back to shared widgets.

Files:
  - library/ui/LibraryScreen.kt — top-level screen, hiltViewModel
    + collectAsStateWithLifecycle, exhaustive when(state)
  - library/widgets/ArtistCard.kt — circular cover + name beneath
  - library/widgets/AlbumCard.kt — 144dp square cover + title +
    artist beneath, matches Flutter spec (~176dp tile width)
  - shared/widgets/EmptyState.kt — generic empty-state widget
    (Lucide Inbox by default), used by Library + reusable for
    Quarantine / search etc.
  - shared/widgets/ErrorRetry.kt — error message + retry button
    (uses LocalActionColors.primary = Moss per design system rule)

Audit-deferred items now triggered:
  - MinstrelApplication implements SingletonImageLoader.Factory and
    wires OkHttpNetworkFetcherFactory(callFactory = { okHttpClient })
    so Coil cover-art requests reuse the shared auth-bearing OkHttp
  - Lucide icons via com.composables:icons-lucide-android:2.2.1 for
    placeholder / decorative iconography

MainActivity now renders LibraryScreen inside a Scaffold (not the
"phase 1" text placeholder). Nav-graph wiring deferred to Phase 5.5
— onArtistClick / onAlbumClick are no-op for now.

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

android/gradle/libs.versions.toml

@@ -71,6 +71,7 @@ media3-datasource-okhttp = { module = "androidx.media3:media3-datasource-okhttp"
 media3-ui = { module = "androidx.media3:media3-ui", version.ref = "media3" }
 coil-compose = { module = "io.coil-kt.coil3:coil-compose", version.ref = "coil" }
 coil-network-okhttp = { module = "io.coil-kt.coil3:coil-network-okhttp", version.ref = "coil" }
+icons-lucide = { module = "com.composables:icons-lucide-android", version = "2.2.1" }
 timber = { module = "com.jakewharton.timber:timber", version.ref = "timber" }
 junit-jupiter = { module = "org.junit.jupiter:junit-jupiter", version.ref = "junit-jupiter" }
 junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher", version = "1.11.3" }