Fix: update buzzheavier link detection logic and improve filename extraction from headers

src/network/direct_download/__init__.py

@@ -20,12 +20,14 @@ def add_direct_download(url: str, title: str, dl_path: Optional[str] = None, hea
             consoleLog(f"Download already active: {title}")
             return
 
-    filename = (
+    raw_filename = (
         detect_filename_from_headers(url, DirectDownloadHandle.USER_AGENT)
         or extract_filename_from_url(url)
         or sanitize_filename(title) + ".zip"
     )
 
+    filename = sanitize_filename(raw_filename)
+
     handle = DirectDownloadHandle(url, filename, dl_path, headers, single_threaded)
     with state.downloads_lock:
         state.active_downloads[url] = handle