KICK-275 Configurable order of tertiary navigation pages

[stefanscholz]

Summary

Adds a global admin setting that defines the order of the pages in the Kickstart tertiary-navigation dropdown (course template, student view, help, plus the Pro course-library and create-template pages). The configured order also determines the default page — the visible page with the lowest order is shown first — and a page set to order 0 is hidden from the dropdown.

As a bonus, when the configuration leaves only a single visible page, the dropdown collapses to a plain page title instead of a one-option selector with a useless toggle arrow.

Changes

• lib.php — new single source of truth for the page list plus ordering helpers:
  • format_kickstart_get_all_pages() — every available page (base + Pro) in canonical order
  • format_kickstart_get_ordered_pages() — applies the admin order; drops pages set to 0; unset settings keep their canonical position (so a fresh install never hides everything); stable tie-break
  • format_kickstart_get_default_nav() — first visible page, with a safe coursetemplate fallback
  • both menu builders (..._get_breadcump_menus, ..._get_action_selector_menus) are now order-aware; the Pro create-template capability gate is preserved
• settings.php — a "Navigation page order" heading and one numeric PARAM_INT field per available page (Pro fields appear only when Pro is installed)
• format.php / list.php — default nav now comes from format_kickstart_get_default_nav() instead of the hardcoded coursetemplate
• general_action_bar + template — render a bold title (no selector) when only one page is visible, and nothing when all are hidden
• lang/en — new strings (pageordersettings, pageorder, …) documenting that 0 hides a page and the lowest number is the default
• version.php — bumped so the new settings register on upgrade

Tests

Added PHPUnit coverage in tests/format_kickstart_test.php:

• format_kickstart_get_all_pages / _get_ordered_pages (default, reorder, hide)
• format_kickstart_get_default_nav (lowest-order default + all-hidden fallback)
• general_action_bar::export_for_template (single-item title vs multi-item selector)

Locally verified with php -l and the Moodle code checker (moodlehq/moodle-cs, --standard=moodle) — clean. PHPUnit/Behat run via this pipeline.

[stefanscholz]

Task linked: KICK-275 Decide order and which sub page is displayed first