feat(android): use Material Outlined LibraryMusic for top-nav Library

Lucide has no music-library glyph — Library / LibraryBig /
SquareLibrary all read as a generic books-on-shelf icon without
a label. Operator picked Material's LibraryMusic (the canonical
"books + music note" symbol used by every major music app) as
the recognizable alternative.

Use the Outlined variant: filled icons would clash with the
neighbouring stroked Lucide icons (House, Search, EllipsisVertical),
but Outlined's stroke style matches Lucide closely enough that
the mix is subtle.

Adds the compose-material-icons-extended dependency (version
pinned by compose-bom). R8 strips unused icons in release builds
so the APK cost is just the ones we actually reference.

android/gradle/libs.versions.toml

@@ -51,6 +51,11 @@ compose-ui-graphics = { module = "androidx.compose.ui:ui-graphics" }
 compose-ui-tooling = { module = "androidx.compose.ui:ui-tooling" }
 compose-ui-tooling-preview = { module = "androidx.compose.ui:ui-tooling-preview" }
 compose-material3 = { module = "androidx.compose.material3:material3" }
+# material-icons-extended supplies the full Material Icons catalog
+# (Outlined / Filled / Rounded / Sharp / TwoTone). We use the Outlined
+# variant for LibraryMusic — its stroke style blends with Lucide.
+# Version pinned by compose-bom.
+compose-material-icons-extended = { module = "androidx.compose.material:material-icons-extended" }
 compose-ui-text-google-fonts = { module = "androidx.compose.ui:ui-text-google-fonts" }
 hilt-android = { module = "com.google.dagger:hilt-android", version.ref = "hilt" }
 hilt-compiler = { module = "com.google.dagger:hilt-compiler", version.ref = "hilt" }