refactor: DRY maint page layout wrapper

[somethingwithproof]

Summary

• add shared maint_render_with_layout() helper for page layout wrappers
• route edit and default action rendering in maint.php through the helper
• preserve existing behavior while reducing duplicated top_header()/bottom_footer() wrapper logic

Tests

• php -l maint.php
• php -l ui_helpers.php
• php -l tests/test_layout_wrapper.php
• php tests/test_layout_wrapper.php

Closes #45

[Copilot]

Pull request overview

Extracts repeated top_header()/bottom_footer() wrapping into a shared maint_render_with_layout() helper in a new ui_helpers.php file, and routes the edit and default actions through it.

Changes:

• New ui_helpers.php with maint_render_with_layout() helper
• maint.php routes edit and default actions through the new helper
• New standalone test verifying wrapper call ordering and routing

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
ui_helpers.php	New shared layout wrapper function
maint.php	Include helper and use it for edit/default actions
tests/test_layout_wrapper.php	Regression test for wrapper behavior and routing

---

You can also share your feedback on Copilot code review. Take the survey.