fix(snapshots): ignore images with no content-type from server

src/snapshots/client.py

@@ -64,16 +64,18 @@ def fetch_url(base: str, url: str) -> str | None:
         content_length = response.headers.get("Content-Length")
         if content_length is not None:
             try:
-                if int(content_length) > 500_000:
+                if int(content_length) > 2_500_000:
                     return None
             except ValueError:
                 pass  # Invalid Content-Length format, proceed to stream
         content = b""
         for chunk in response.iter_content(chunk_size=1024):
             content += chunk
-            if len(content) > 500_000:
+            if len(content) > 2_500_000:
                 return None
         content_type = response.headers.get("Content-Type", "")
+        if content_type == "":
+            return None
         return encode_data_uri(content, content_type)
     except requests.exceptions.RequestException:
         return None