feat(performance): implement comprehensive performance improvements for Worklenz frontend

- Introduced a new document summarizing performance optimizations across the application.
- Applied React.memo(), useMemo(), and useCallback() to key components to minimize unnecessary re-renders and optimize rendering performance.
- Implemented a route preloading system to enhance navigation speed and user experience.
- Added performance monitoring utilities for development to track component render times and function execution.
- Enhanced lazy loading and suspense boundaries for better loading states.
- Conducted production optimizations, including TypeScript error fixes and memory management improvements.
- Memoized style and configuration objects to reduce garbage collection pressure and improve memory usage.

worklenz-frontend/src/components/suspense-fallback/suspense-fallback.tsx

@@ -1,46 +1,50 @@
+import React, { memo } from 'react';
 import { colors } from '@/styles/colors';
 import { getInitialTheme } from '@/utils/get-initial-theme';
 import { ConfigProvider, theme, Layout, Spin } from 'antd';
 
-// Loading component with theme awareness
-export const SuspenseFallback = () => {
+// Memoized loading component with theme awareness
+export const SuspenseFallback = memo(() => {
   const currentTheme = getInitialTheme();
   const isDark = currentTheme === 'dark';
 
+  // Memoize theme configuration to prevent unnecessary re-renders
+  const themeConfig = React.useMemo(() => ({
+    algorithm: isDark ? theme.darkAlgorithm : theme.defaultAlgorithm,
+    components: {
+      Layout: {
+        colorBgLayout: isDark ? colors.darkGray : '#fafafa',
+      },
+      Spin: {
+        colorPrimary: isDark ? '#fff' : '#1890ff',
+      },
+    },
+  }), [isDark]);
+
+  // Memoize layout style to prevent object recreation
+  const layoutStyle = React.useMemo(() => ({
+    position: 'fixed' as const,
+    width: '100vw',
+    height: '100vh',
+    background: 'transparent',
+    transition: 'none',
+  }), []);
+
+  // Memoize spin style to prevent object recreation
+  const spinStyle = React.useMemo(() => ({
+    position: 'absolute' as const,
+    top: '50%',
+    left: '50%',
+    transform: 'translate(-50%, -50%)',
+  }), []);
+
   return (
-    <ConfigProvider
-      theme={{
-        algorithm: isDark ? theme.darkAlgorithm : theme.defaultAlgorithm,
-        components: {
-          Layout: {
-            colorBgLayout: isDark ? colors.darkGray : '#fafafa',
-          },
-          Spin: {
-            colorPrimary: isDark ? '#fff' : '#1890ff',
-          },
-        },
-      }}
-    >
-      <Layout
-        className="app-loading-container"
-        style={{
-          position: 'fixed',
-          width: '100vw',
-          height: '100vh',
-          background: 'transparent',
-          transition: 'none',
-        }}
-      >
-        <Spin
-          size="large"
-          style={{
-            position: 'absolute',
-            top: '50%',
-            left: '50%',
-            transform: 'translate(-50%, -50%)',
-          }}
-        />
+    <ConfigProvider theme={themeConfig}>
+      <Layout className="app-loading-container" style={layoutStyle}>
+        <Spin size="large" style={spinStyle} />
       </Layout>
     </ConfigProvider>
   );
-};
+});
+
+SuspenseFallback.displayName = 'SuspenseFallback';