Add edit buttons for homeworks and projects in cadmin

[Copilot]

Course admin panel had edit buttons only for courses, not for homeworks/projects. Additionally, homework actions (Set Correct Answers, Score) were hidden when homework state was Open.

Changes

• Added edit icons for homeworks and projects - Django admin links with edit icons now appear next to homework and project titles, matching the existing course edit pattern
• Fixed homework actions visibility - "Set Correct Answers" and "Score" options now available for both Open and Closed states instead of only Closed

<!-- Before: only showed actions when hw.state == 'CL' -->
<!-- After: shows actions for both open and closed -->
{% if hw.state == 'OP' or hw.state == 'CL' %}
  <option value="{% url 'cadmin_homework_set_correct_answers' course.slug hw.slug %}">Set Correct Answers</option>
  <option value="{% url 'cadmin_homework_score' course.slug hw.slug %}">Score</option>
{% endif %}

Screenshot

Edit icons (pencil) appear next to homework and project titles, providing quick access to Django admin panel for editing.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Edit buttons for cadmin</issue_title>
<issue_description>We used to have edit buttons for homeworks and projects. but now we only have this for course. the edit button brings us to the django admin panel where we can edit the entity.

Add edit icons in the list of homeworks and projects next to the name

also if homework is open, I can only see statistics in action. this is not correct - I still want to set correct answers and score the homework </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Edit buttons for cadmin #145

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