Fix spinner appearing every 5 secds

Provider/frontend/src/lib/Spinner.svelte

@@ -8,16 +8,18 @@
     // Subscribe to the store
     const unsubscribe = pendingRequests.subscribe(count => {
         if (count > 0) {
-            // Only show the spinner if the request takes longer than 300ms
+            // Only show the spinner if the request takes longer than 1000ms
             if (!timer) {
                 timer = setTimeout(() => {
                     showSpinner = true;
-                }, 300);
+                }, 1000);
             }
         } else {
             // Instantly hide the spinner when all requests finish
-            clearTimeout(timer);
-            timer = null;
+            if (timer) {
+                clearTimeout(timer);
+                timer = null;
+            }
             showSpinner = false;
         }
     });