refactor: DRY page layout wrapper in upses action routing #15
Description
Problem
upses.php repeats the same page wrapper sequence (top_header(), renderer, bottom_footer()) in multiple action branches.
Proposed change
- introduce a shared UI layout wrapper helper
- route edit/list rendering branches through the helper
- keep behavior unchanged while reducing duplicated wrapper logic
Tests
- add standalone regression test for wrapper call ordering and callback execution
- include a routing assertion that action branches use the shared helper
- run syntax checks for touched files