Reworked cache for news and update manifest.

ptlinux/news.py

@@ -153,7 +153,13 @@ def fetch_news(
 		_write_cache(cache_path, articles)
 		return articles
 	except (OSError, NewsError, UnicodeDecodeError, json.JSONDecodeError):
-		return _read_cache(cache_path)
+		return read_cached_news(cache_path)
+
+
+def read_cached_news(cache_path: Path) -> tuple[NewsArticle, ...]:
+	"""Read the last valid news feed without performing network I/O."""
+
+	return _read_cache(cache_path)
 
 
 def fetch_latest_broadcast(
@@ -179,7 +185,13 @@ def fetch_latest_broadcast(
 		_write_broadcast_cache(cache_path, broadcast)
 		return broadcast
 	except (OSError, NewsError, UnicodeDecodeError, json.JSONDecodeError):
-		return _read_broadcast_cache(cache_path)
+		return read_cached_broadcast(cache_path)
+
+
+def read_cached_broadcast(cache_path: Path) -> Broadcast | None:
+	"""Read the last valid broadcast without performing network I/O."""
+
+	return _read_broadcast_cache(cache_path)
 
 
 def _parse_news(payload: bytes) -> tuple[NewsArticle, ...]:
@@ -288,7 +300,7 @@ def _read_cache(path: Path) -> tuple[NewsArticle, ...]:
 		if not isinstance(value, list):
 			return ()
 		return tuple(NewsArticle(**item) for item in value if isinstance(item, dict))
-	except (OSError, TypeError, json.JSONDecodeError):
+	except (OSError, UnicodeError, TypeError, json.JSONDecodeError):
 		return ()
 
 
@@ -309,7 +321,7 @@ def _read_broadcast_cache(path: Path) -> Broadcast | None:
 	try:
 		value = json.loads(path.read_text(encoding="utf-8"))
 		return Broadcast(**value) if isinstance(value, dict) else None
-	except (OSError, TypeError, json.JSONDecodeError):
+	except (OSError, UnicodeError, TypeError, json.JSONDecodeError):
 		return None