Add privacy checks for profile links in course detail page

[Copilot]

Problem

When viewing a course detail page, profile links were displayed for both teachers and students regardless of their privacy settings. Clicking on a link to a private profile would result in a 404 error, creating a poor user experience.

Solution

This PR adds privacy checks before displaying profile links in the course detail page:

Changes Made

1. Teacher Profile Link (lines 217-223)

   • Added conditional check {% if course.teacher.profile.is_profile_public %} before rendering the "View Profile" button
   • Only users with public profiles will have their profile link displayed

2. Student Profile Links in Enrollments Table (lines 852-858)

   • Added conditional check {% if enrollment.student.profile.is_profile_public %} before rendering the profile icon link
   • Prevents students with private profiles from having clickable profile links in the course enrollments table

Example

Before: All users had "View Profile" links, even those with private profiles

<a href="{% url 'public_profile' course.teacher.username %}">
  <i class="fas fa-user mr-2"></i>
  View Profile
</a>

After: Profile links only shown for public profiles

{% if course.teacher.profile.is_profile_public %}
  <a href="{% url 'public_profile' course.teacher.username %}">
    <i class="fas fa-user mr-2"></i>
    View Profile
  </a>
{% endif %}

Related Issue

This is a subset of the changes from PR #622, specifically keeping only the course detail page modifications as requested.

Testing

• Template passes djlint formatting checks
• Privacy logic correctly hides profile links when is_profile_public is False
• UI remains intact for public profiles

Original prompt

just keep the changes to course detail page @alphaonelabs/alphaonelabs-education-website/pull/622

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