fix: hide Featured section when there are no featured posts

[jatinder14]

Summary

• With `show_featured_posts` enabled but no featured posts, Source still rendered an empty Featured heading/section.
• Wrap the section in `{{#if featured}}` so it only appears when the query returns posts (same approach as Dawn).

Test plan

• Enable featured posts in Source design settings with zero featured posts → Featured block is gone
• Mark a post featured → Featured block appears with that post

Closes #95

[coderabbitai]

Walkthrough

The featured template now wraps the featured section in an {{#if featured}} guard. When the posts query returns a truthy featured value, the title, feed container, and featured post cards render; otherwise, the section is omitted.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR satisfies #95 by preventing the Featured row from rendering when there are no featured posts.
Out of Scope Changes check	✅ Passed	The changes appear limited to the Featured section condition and do not introduce unrelated scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title clearly summarizes the main change: hiding the Featured section when no featured posts exist.
Description check	✅ Passed	The description directly matches the change and test plan, describing the empty Featured section fix.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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