feat(tv): update video player to handle ended event and improve channel navigation

compose.yml

@@ -39,10 +39,9 @@ services:
     build:
       context: ./k-tv-frontend
       args:
-        # Browser-visible backend URL — must be reachable from the user's browser.
-        # If running on a server: http://your-server-ip:3000/api/v1
-        # Baked into the client bundle at build time; rebuild after changing.
-        NEXT_PUBLIC_API_URL: ${NEXT_PUBLIC_API_URL:-http://localhost:3000/api/v1}
+        # Browser-visible backend URL — baked into the client bundle at build time.
+        # Rebuild the image after changing this.
+        NEXT_PUBLIC_API_URL: ${NEXT_PUBLIC_API_URL:-http://localhost:4000/api/v1}
     ports:
       - "${FRONTEND_PORT:-3001}:3001"
     environment: