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>

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);