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