fix: skip URL entries in save_text_as_source to prevent Path() errors

When raw_text contains URLs (e.g. from wallabag_atom parser), split()
breaks them into fragments that Path() tries to read as local files.
This causes spurious "No such file" errors and random paths to be
accessed. Skip entries that look like URLs before checking Path.exists().

Fixes #1000

archivebox/parsers/__init__.py

@@ -155,6 +155,9 @@ def save_text_as_source(raw_text: str, filename: str='{ts}-stdin.txt', out_dir:
     referenced_texts = ''
 
     for entry in raw_text.split():
+        # Skip URLs - Path() can't handle them and they aren't local files
+        if any(entry.startswith(s) for s in ('http://', 'https://', 'ftp://')):
+            continue
         try:
             if Path(entry).exists():
                 referenced_texts += Path(entry).read_text()