add a cooldown on the force refresh action (#1556)

commafeed-client/src/hooks/useNow.ts

@@ -0,0 +1,10 @@
+import { useEffect, useState } from "react"
+
+export const useNow = (interval = 1000): Date => {
+    const [time, setTime] = useState(new Date())
+    useEffect(() => {
+        const t = setInterval(() => setTime(new Date()), interval)
+        return () => clearInterval(t)
+    }, [interval])
+    return time
+}