The code review leaderboard was querying the wrong model, using incorrect field paths, and had no null safety, causing it to show "No code review data available" despite existing reviews.

Changes

Backend (website/views/user.py)

• Changed query from GitHubIssue traversal to direct GitHubReview query
• Added extract_github_username() helper to parse GitHub URLs for avatar display
• Filtered both leaderboards to tracked repositories only (pull_request__repo__isnull=False)
• Replaced exclude(field__isnull=True) with filter(field__isnull=False) for performance

Frontend (website/templates/leaderboard_global.html)

• Fixed field paths: reviews__reviewer__user__* → reviewer__user__*
• Added 3-level avatar fallback: GitHub username → Gravatar → default
• Added null checks for usernames and GitHub links
• Standardized styling to #e74c3c and rounded-lg across all panels

Before/After

# Before: Wrong model and field path
reviewed_pr_leaderboard = GitHubReview.objects.values(
    "reviews__reviewer__user__username"  # Wrong field path
)

# After: Correct model and filtering
code_review_leaderboard = GitHubReview.objects.filter(
    reviewer__user__isnull=False,
    pull_request__repo__isnull=False
).values("reviewer__user__username")  # Correct field path

{# Before: No null safety, wrong fields #}
<img src="https://github.com/{{ leader.reviews__reviewer__user__username }}.png">

{# After: Null-safe with proper field extraction #}
{% if leader.github_username %}
    <img src="https://github.com/{{ leader.github_username }}.png">
{% elif leader.reviewer__user__email %}
    <img src="{% gravatar_url leader.reviewer__user__email 50 %}">
{% else %}
    <img src="{% gravatar_url '[email protected]' 50 %}">
{% endif %}

Fixes #4569, #4660

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