- Implement state filtering in the CitiesController
- Add new scope `by_state` in the City model
- Update cities index view to include state dropdown
- Add slug column to states for friendly URLs
- Update English locale to include 'All States'
This commit enhances the cities index page by allowing users to
filter cities based on the selected state. It introduces a new
scope in the City model for state filtering and updates the
view to present a dropdown for state selection. Additionally,
it adds a slug column to the states table to support friendly
URLs, improving the overall user experience.