Adds a logout Stimulus controller that sends a message to the service
worker to clear all cached content when the user logs out. This ensures
that cached data from one user isn't accessible after logout.
The implementation:
- Adds logout_controller.js that posts { action: "clearCache" } to the
service worker via postMessage
- Updates logout buttons to use the controller on form submission
Also fixes data-turbo placement: moved from button to form element where
it actually takes effect for disabling Turbo Drive form submissions.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Rosa Gutierrez