Let an error body that is an array still be read

Google answers some failures with a JSON array holding the object every
other provider sends on its own. _extract_error called .get() on it and
raised AttributeError, which is not the ApiError every caller is holding,
so a 503 from Google took the whole dictation down instead of pasting the
raw transcript with the failure shown beside it.

Found by dictating against a Google AI Studio outage:

  HTTP Error 503: Service Unavailable
  AttributeError: 'list' object has no attribute 'get'

It runs while an exception is being raised, so it now ends in a string
whatever arrives.

Co-Authored-By: Claude Opus 5 <[email protected]>

dikte/api.py

@@ -262,10 +262,23 @@ def _request(url, data, headers, timeout=120, aborter=None):
 
 
 def _extract_error(body):
+    """The line worth showing out of a failed request's body.
+
+    Whatever comes back, this has to end in a string: it is called while an
+    ApiError is being raised, and an exception thrown here would escape the
+    `except ApiError` every caller is holding and lose the dictation the raw
+    transcript would otherwise have been pasted from.
+    """
     try:
         payload = json.loads(body)
     except json.JSONDecodeError:
         return body[:300]
+    if isinstance(payload, list):
+        # Google answers some failures with an array holding the object the
+        # other providers send on its own.
+        payload = next((item for item in payload if isinstance(item, dict)), None)
+    if not isinstance(payload, dict):
+        return body[:300]
     err = payload.get("error")
     if isinstance(err, dict):
         return err.get("message") or json.dumps(err)[:300]