Course builder improvements

[brianhogg]

Description

• Show permalink for new lessons and quizzes right after saving
• Quiz set to Published by default
• Create named quiz url using title if none manually entered
• Add lesson description (content)
• Hide the "Add Existing Lesson" modal after selecting a lesson
• Improved section selection, and highlighting of the current section

Fixes #3033, #3056, #3097, #2938, #3030

How has this been tested?

Screenshots

Types of changes

Checklist:

• This PR requires and contains at least one changelog file.
• My code has been tested.
• My code passes all existing automated tests.
• My code follows the LifterLMS Coding & Documentation Standards.

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Note

Medium Risk
Changes touch both the course builder sync pipeline (JS + PHP) and lesson/quiz persistence, including new logic to conditionally overwrite lesson content. Risk is moderate because regressions could affect saving behavior and sidebar/editor UX across lessons, quizzes, and assignments.

Overview
Improves the Course Builder editing flow by adding in-builder lesson content editing (with a new content_added_in_builder flag) and preventing builder saves from overwriting existing lesson content that was created outside the builder.

Updates the sync/save response handling so newly saved lessons/quizzes/assignments can immediately display refreshed permalinks/slugs/titles without full re-renders, and sets new quizzes to publish by default (with quiz posts created using the provided title to generate a named URL).

Polishes builder UX: closes the sidebar editor when the selected model is trashed, ensures the “Add Existing Lesson” popover reliably closes after selection, and refines section selection/highlighting (auto-select first section on load, broader click target, improved selected styling).

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[brianhogg]

@cursor review

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