fix(builder): display quiz post ID in course builder quiz card header

[faisalahammad]

Summary

When multiple quizzes share the same title, course instructors cannot tell them apart while configuring quiz-based engagements. This change adds the quiz post ID to the course builder quiz card header, mirroring the existing lesson ID display.

Fixes #3024

Changes

includes/admin/views/builder/quiz.php

Before:

<h3 class="llms-headline llms-model-title">
    <?php esc_html_e( 'Title', 'lifterlms' ); ?>: <span class="llms-input llms-editable-title" contenteditable="true" data-attribute="title" data-original-content="{{{ data.get( 'title' ) }}}" data-required="required">{{{ data.get( 'title' ) }}}</span>
</h3>

<div class="llms-headline llms-quiz-points">

After:

<h3 class="llms-headline llms-model-title">
    <?php esc_html_e( 'Title', 'lifterlms' ); ?>: <span class="llms-input llms-editable-title" contenteditable="true" data-attribute="title" data-original-content="{{{ data.get( 'title' ) }}}" data-required="required">{{{ data.get( 'title' ) }}}</span>
</h3>

<# if ( ! data.has_temp_id() ) { #>
    <span class="llms-item-id"><?php esc_html_e( 'ID:', 'lifterlms' ); ?> {{{ data.get( 'id' ) }}}</span>
<# } #>

<div class="llms-headline llms-quiz-points">

Why: The builder quiz model already exposes id and has_temp_id(), so the template change is the minimal fix. Hidden temp IDs for unsaved quizzes match the lesson card behavior.

Testing

Test 1: Saved quiz shows ID

1. Open a course in the course builder.
2. Add a lesson and create a new quiz inside it.
3. Save the course so the quiz gets a real post ID.
4. Reopen the quiz card header.

Result: ID: <post_id> appears below the quiz title.

Test 2: Unsaved quiz hides ID

1. Add a new lesson and start a new quiz.
2. Do not save.

Result: The ID: label is not shown while the quiz still has a temp_ ID.

Test 3: Lesson ID display unchanged

1. Open a saved lesson card.

Result: The existing ID: display for lessons is unchanged.

Screenshot