fix(android): stop Home Crossfade firing on every section emission (#1)

User-visible: Home flickered continuously after first sign-in until
all sections settled. The top-level Crossfade keyed on the state
INSTANCE — and because each section's flow emission produces a new
UiState.Success(data), Crossfade ran its 300ms fade animation on
every per-section hydration tick. Six sections cascading in over
~1s read as continuous flicker.

Fix: key the Crossfade on state::class. Loading -> Success -> Empty
-> Error class transitions still animate; Success -> Success(with
more sections) recompositions just update the LazyColumn normally
through Compose's standard diff path.

android/app/src/main/java/com/fabledsword/minstrel/home/ui/HomeScreen.kt

@@ -367,8 +367,17 @@ fun HomeScreen(
             onRefresh = { viewModel.refresh().join() },
             modifier = Modifier.fillMaxSize().padding(inner),
         ) {
-            Crossfade(targetState = state, label = "home-state") { s ->
-                when (s) {
+            // Key Crossfade on the state CLASS, not the instance. Each
+            // section emission produces a new UiState.Success(data); if
+            // we keyed on `state` directly, every per-section
+            // hydration tick would re-run the 300ms crossfade, and
+            // first-sign-in (six sections cascading in) reads as
+            // continuous flicker. Keying on the class restricts the
+            // animation to Loading↔Success↔Empty↔Error transitions and
+            // lets normal Success→Success recompositions update the
+            // LazyColumn without a fade.
+            Crossfade(targetState = state::class, label = "home-state") { _ ->
+                when (val s = state) {
                     UiState.Loading -> HomeSkeletonContent()
                     UiState.Empty -> EmptyState(
                         title = "Welcome to Minstrel",