Update loading bar and spinner animations

The loading bar's completion property on unmounting has been removed to make its behavior more consistent. The css classes have been updated for spinner animation: The 'zoom-in-80' class was changed to 'zoom-in-50' and 'slide-in-from-bottom-4' was added. Also, the react-top-loading-bar's continuous start time has been increased to 300.

packages/ui/src/makerkit/global-loader.tsx

@@ -16,13 +16,13 @@ export function GlobalLoader({
   return (
     <>
       <If condition={displayTopLoadingBar}>
-        <TopLoadingBarIndicator completeOnUnmount={false} />
+        <TopLoadingBarIndicator />
       </If>
 
       <If condition={displaySpinner}>
         <div
           className={
-            'zoom-in-80 flex flex-1 flex-col items-center justify-center py-48 animate-in fade-in'
+            'flex flex-1 flex-col items-center justify-center py-48 animate-in fade-in zoom-in-50 slide-in-from-bottom-4'
           }
         >
           <LoadingOverlay displayLogo={displayLogo} fullPage={fullPage} />

packages/ui/src/makerkit/top-loading-bar-indicator.tsx

@@ -1,35 +1,31 @@
 'use client';
 
-import { createRef, useEffect, useRef } from 'react';
+import { createRef, useEffect } from 'react';
 
 import type { LoadingBarRef } from 'react-top-loading-bar';
 import LoadingBar from 'react-top-loading-bar';
 
-export function TopLoadingBarIndicator({
-  completeOnUnmount = true,
-}: {
-  completeOnUnmount?: boolean;
-}) {
+let running = false;
+
+export function TopLoadingBarIndicator() {
   const ref = createRef<LoadingBarRef>();
-  const runningRef = useRef(false);
 
   useEffect(() => {
-    if (!ref.current || runningRef.current) {
+    if (!ref.current || running) {
       return;
     }
 
+    running = true;
+
     const loadingBarRef = ref.current;
 
-    loadingBarRef.continuousStart(0, 250);
-    runningRef.current = true;
+    loadingBarRef.continuousStart(0, 300);
 
     return () => {
-      if (completeOnUnmount) {
-        loadingBarRef.complete();
-      }
-      runningRef.current = false;
+      loadingBarRef.complete();
+      running = false;
     };
-  }, [completeOnUnmount, ref]);
+  }, [ref]);
 
   return (
     <LoadingBar