Ensure full-screen ads always display on the horoscope page

Introduce a `forceShow` prop to the InterstitialAd component, and utilize it in `horoscope.tsx` to make the interstitial ad appear on every visit to the horoscope page, bypassing the previous article visit counter logic.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 23852c00-4779-460a-9e0c-d09fee4b6c92
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 49bdd096-9b74-4b58-b1ec-4755d50170b1
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/f209e72a-0939-48fa-84fc-57854de71967/23852c00-4779-460a-9e0c-d09fee4b6c92/OPD8Ro3
Replit-Helium-Checkpoint-Created: true

client/src/components/interstitial-ad.tsx

@@ -5,10 +5,15 @@ import AdSense from "./adsense";
 const COUNTER_KEY = "folx-interstitial-count";
 const DELAY_MS = 3000;
 
-export default function InterstitialAd() {
+export default function InterstitialAd({ forceShow }: { forceShow?: boolean } = {}) {
   const [visible, setVisible] = useState(false);
 
   useEffect(() => {
+    if (forceShow) {
+      const timer = setTimeout(() => setVisible(true), DELAY_MS);
+      return () => clearTimeout(timer);
+    }
+
     const raw = sessionStorage.getItem(COUNTER_KEY);
     const count = raw ? parseInt(raw, 10) : 0;
     const next = count + 1;
@@ -19,7 +24,7 @@ export default function InterstitialAd() {
 
     const timer = setTimeout(() => setVisible(true), DELAY_MS);
     return () => clearTimeout(timer);
-  }, []);
+  }, [forceShow]);
 
   useEffect(() => {
     if (visible) {