fix: ensure proper cleanup of SSE events with AbortController

frontend/src/app/streams/[id]/page.tsx

@@ -147,12 +147,14 @@ export default function StreamDetailsPage() {
 
   // Handle SSE events
   useEffect(() => {
+    const controller = new AbortController();
+
     if (streamEvents.length > 0) {
-      const controller = new AbortController();
       fetchStream(controller.signal);
       fetchEvents(eventsPage, controller.signal);
-      return () => controller.abort();
     }
+
+    return () => controller.abort();
   }, [streamEvents, fetchStream, fetchEvents, eventsPage]);
 
   // Live claimable counter

frontend/tsconfig.json

@@ -5,6 +5,8 @@
     "allowJs": true,
     "skipLibCheck": true,
     "strict": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
     "noEmit": true,
     "esModuleInterop": true,
     "module": "esnext",