fix: force React to remount tab content when switching tabs

- Add key prop based on activeTab to wrapper div
- Forces complete unmount/remount of content when switching tabs
- Prevents DOM element reuse that was causing blog posts to bleed into highlights tab

src/components/Explore.tsx

@@ -487,7 +487,9 @@ const Explore: React.FC<ExploreProps> = ({ relayPool, eventStore, settings, acti
         </div>
       </div>
 
-      {renderTabContent()}
+      <div key={activeTab}>
+        {renderTabContent()}
+      </div>
     </div>
   )
 }