fix: season list re-reads via provider dependency; ignore pid files

seasonsProvider now watches seasonRefreshProvider instead of relying on
a HomeScreen ref.listen, making the refresh ordering-independent. Removes
the redundant listener from HomeScreen. Appends *.pid to .gitignore.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitignore

@@ -48,3 +48,4 @@ app.*.map.json
 lib/l10n/gen/
 .superpowers/
 CLAUDE.md
+*.pid

lib/state/providers.dart

@@ -41,9 +41,13 @@ final seasonFlowProvider = NotifierProvider<SeasonFlowNotifier, SeasonFlow?>(
 final contentRepositoryProvider =
     Provider<ContentRepository>((ref) => ContentRepository());
 
-final seasonsProvider = FutureProvider<List<SeasonPack>>(
+final seasonsProvider = FutureProvider<List<SeasonPack>>((ref) {
-  (ref) => ref.read(contentRepositoryProvider).availableSeasons(),
+  // Watching (not awaiting) the one-shot sync makes this provider re-run
-);
+  // once when the sync completes, picking up freshly cached packs. Local
+  // content loads immediately; the network never blocks this future.
+  ref.watch(seasonRefreshProvider);
+  return ref.read(contentRepositoryProvider).availableSeasons();
+});
 
 /// One background content sync per app session. Home listens and refreshes
 /// the season list when new packs arrived.

lib/ui/screens/home_screen.dart

@@ -21,11 +21,6 @@ class HomeScreen extends ConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
-    ref.listen(seasonRefreshProvider, (_, next) {
-      if (next is AsyncData<bool> && next.value == true) {
-        ref.invalidate(seasonsProvider);
-      }
-    });
     final l10n = AppLocalizations.of(context)!;
     final streak = ref.watch(streakProvider);
     final best = ref.watch(endlessBestProvider);