feat: replace views stat with topic-category breakdown on creator detail page

frontend/src/pages/CreatorDetail.tsx

@@ -106,8 +106,25 @@ export default function CreatorDetail() {
           )}
           <span className="creator-detail__stats">
             {creator.video_count} video{creator.video_count !== 1 ? "s" : ""}
+            {techniques.length > 0 && (
+              <>
                 <span className="queue-card__separator">·</span>
-            {creator.view_count.toLocaleString()} views
+                {Object.entries(
+                  techniques.reduce<Record<string, number>>((acc, t) => {
+                    const cat = t.topic_category || "Uncategorized";
+                    acc[cat] = (acc[cat] || 0) + 1;
+                    return acc;
+                  }, {}),
+                )
+                  .sort(([, a], [, b]) => b - a)
+                  .map(([cat, count], i) => (
+                    <span key={cat} className="creator-detail__topic-stat">
+                      {i > 0 && <span className="queue-card__separator">·</span>}
+                      {cat}: {count}
+                    </span>
+                  ))}
+              </>
+            )}
           </span>
         </div>
       </header>