Frontend should allow routes/url for every menu/dialogue

This would allow easier integration between Cockpit and BlueOS and also benefit support.

Of course, this comes at the cost of creating stable routes and maintaining them.

The issue names no files, tests, or entry points. Start by locating the frontend menu and dialogue components and reviewing how navigation currently works. Define the stable-route scope with maintainers; done means every agreed menu and dialogue can be opened through a usable URL for Cockpit, BlueOS integration, and support.

Written by the indexing model from the issue text.