suffix repeated disc titles with their disc number

When two discs of an album share a title, showing "Live" alone is
ambiguous, so render "Live: Disc 1"/"Live: Disc 2". Unique titles stay
as-is. Also drop the header from titleLarge to a semibold titleMedium so
longer titles fit on one line.

app/src/test/kotlin/com/subtracks/ui/AlbumDiscsTest.kt

@@ -44,6 +44,16 @@ class AlbumDiscsTest {
         assertEquals(0, nodesWithText("Disc 1"))
     }
 
+    @Test
+    fun repeatedDiscTitlesGetTheDiscNumber() {
+        setContent(
+            listOf(song("s-a", disc = 1, track = 1), song("s-b", disc = 2, track = 1)),
+            discs = listOf(disc(1, "Live"), disc(2, "Live")),
+        )
+        assertEquals(1, nodesWithText("Live: Disc 1"))
+        assertEquals(1, nodesWithText("Live: Disc 2"))
+    }
+
     @Test
     fun discHeadersFallBackToTheDiscNumber() {
         setContent(listOf(song("s-a", disc = 1, track = 1), song("s-b", disc = 2, track = 1)))