Updated app/views/shared/_flash_messages.html.haml to use sanitize(content)
instead of = content. This ensures that HTML content in flash messages,
such as the prompt to add an activity after creating a garden, is
correctly rendered even if its html_safe status is lost during session
serialization.
Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>