assignment: show chapter number in eyebrow

Co-authored-by: Ona <no-reply@ona.com>

Author: Siddhant-K-code

src/components/Assignment.astro

@@ -15,7 +15,7 @@ const chapterSlug = `ch${String(chapter).padStart(2, "0")}`;
   <!-- Header bar -->
   <div class="assignment-header">
     <div class="assignment-header-left">
-      <span class="assignment-eyebrow">Practical Assignment</span>
+      <span class="assignment-eyebrow">Ch. {String(chapter).padStart(2, "0")} · Practical Assignment</span>
       <h2 class="assignment-title">{title}</h2>
     </div>
     <div class="assignment-actions">