Fix: Strip formatting when pasting into builder title fields (#3093)

* Show Mark Complete button when quiz requirements are met

Fixes #3058

When a lesson has an attached quiz, students who mark the lesson as
incomplete can now re-mark it as complete without retaking the quiz,
provided they have already met the quiz requirements.

Changes:
- Modified llms_show_mark_complete_button() to check quiz completion status
- Added 4 new unit tests for quiz completion scenarios

* Fix: Strip formatting when pasting into builder title fields

Adds a paste event handler for contenteditable elements that
do not have the data-formatting attribute. This ensures that
lesson, quiz, and section titles receive plain text when
users paste formatted content from external sources.

Fixes #3057

* Remove mark complete changes (belong to different PR #3092)

* Add changelog entry for PR #3093

Fixes #3057

Author: faisalahammad

.changelogs/3093.yml

@@ -0,0 +1,7 @@
+significance: patch
+type: fixed
+links:
+  - "#3057"
+attributions:
+  - "@faisalahammad"
+entry: Strip formatting when pasting into Course Builder title fields.

assets/js/builder/Views/_Editable.js

@@ -9,7 +9,8 @@
  * @since 3.16.0
  * @since 3.25.4 Unknown
  * @since 3.37.11 Replace reference to `wp.editor` with `_.getEditor()` helper.
- * @version 3.37.11
+ * @since [version] Add paste event handler for plain contenteditable elements to strip formatting. Fixes #3057.
+ * @version [version]
  */
 define( [], function() {
 
@@ -36,6 +37,7 @@ define( [], function() {
 			'keydown .llms-input': 'on_keydown',
 			'input .llms-input[type="number"]': 'on_blur',
 			'paste .llms-input[data-formatting]': 'on_paste',
+			'paste .llms-input[contenteditable]:not([data-formatting])': 'on_paste',
 		},
 
 		/**