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/app/build.gradle.kts

@@ -156,6 +156,7 @@ dependencies {
 
     implementation(libs.coil.compose)
     implementation(libs.coil.network.okhttp)
+    implementation(libs.icons.lucide)
 
     implementation(libs.timber)