fix: handle JSON decode error in monocular search

The return value of json.NewDecoder().Decode() was not being checked,
so malformed responses from the search API would silently return empty
results instead of reporting an error.

Signed-off-by: Woravit Ariyakunatorn <wariyakunatorn@gmail.com>

internal/monocular/search.go

@@ -135,7 +135,9 @@ func (c *Client) Search(term string) ([]SearchResult, error) {
 
 	result := &searchResponse{}
 
-	json.NewDecoder(res.Body).Decode(result)
+	if err := json.NewDecoder(res.Body).Decode(result); err != nil {
+		return nil, fmt.Errorf("failed to decode response from %s: %w", p.String(), err)
+	}
 
 	return result.Data, nil
 }