refactor: DRY audit page layout wrapper #46
Description
Problem
audit.php repeats the same page layout wrapper sequence (top_header(), renderer, bottom_footer()) in action routing.
Proposed change
- add a shared UI layout wrapper helper for audit pages
- route wrapped action paths through the helper
- preserve behavior while reducing duplicated wrapper logic
Tests
- add standalone regression test for wrapper call ordering and callback execution
- include routing assertions that wrapped actions use the helper
- run syntax checks for touched files