* Add breadcrumbs support across application
Fixes #1896
* Potential fix for tests
* Simplify breadcrumbs implementation
Remove complex breadcrumbs logic from controllers and concern, replacing with a simpler default approach that sets a basic breadcrumb based on the current controller name
* Refactor page header and breadcrumbs rendering
Remove complex breadcrumbs helper method and update layout to use more flexible content_for approach for page headers and breadcrumbs
* Add fallback breadcrumbs rendering to settings layout
