Back navigation from detail view should preserve list filters

When navigating from a filtered list view (e.g. program items with active dimension filters) to a detail view, and then pressing "Back" or "Back to program management", the filters are lost and the list resets.

## Requested behaviour

The back navigation from a detail view should return to the list in its previous filtered state, either by using the browser's back button or by preserving filter state in the URL.

## Background

Requested in customer feedback.

Start by locating the list and detail views, their back-navigation handlers, and the code that applies dimension filters. Reproduce navigation from a filtered program-items list, then ensure Back or “Back to program management” restores the previous filtered state, either through browser history or URL state.

Written by the indexing model from the issue text.