fix queue overlay, focus and artwork loading glitches

- scope QueueViewModel to the queue overlay so its rows are released on close
  and a reopened queue cannot show two overlapping lists; key open() on the
  overlay visibility so a fast reopen still rescans and refocuses
- reuse row ids by song identity when a window (re)loads so Compose does not
  cross-fade the old rows out while the new ones fade in
- fade the artist name scrim in and key its busy check on the thumbnail, the
  same ref the theme already uses, so a cached seed shows it immediately
- start detail gradients from the neutral base artwork until the seed resolves
  instead of inheriting the now playing theme and snapping to the artist colours
- fade the now playing and detail status bar scrims by putting the graphicsLayer
  before statusBarScrim(), which otherwise drew the background outside the layer
- decode full-size and hero covers with FilterQuality.High to stop the moire
  during overscroll stretch

app/src/test/kotlin/com/subtracks/ui/playback/QueueViewModelTest.kt

@@ -108,6 +108,23 @@ class QueueViewModelTest {
         assertEquals(1L, dropTarget(listOf(row(0), row(3), row(1), row(2)), index = 1, from = 3))
     }
 
+    @Test
+    fun reopeningReusesRowIdentitySoComposeDoesNotCrossFadeTwoLists() {
+        runBlocking { seedSongs(200) }
+        controller.playSongs(1, 100)
+        await { controller.state.value.position == 100L }
+
+        viewModel.open()
+        await { viewModel.ready }
+        val firstIds = viewModel.rows.map { it.id }
+        val firstGeneration = viewModel.generation
+
+        viewModel.open()
+        await { viewModel.generation > firstGeneration }
+
+        assertEquals(firstIds, viewModel.rows.map { it.id })
+    }
+
     @Test
     fun reorderingMovesTheRowLocally() {
         runBlocking { seedSongs(200) }