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/features/theme/ThemeWrapper.tsx

@@ -1,5 +1,5 @@
 import { ConfigProvider, theme } from 'antd';
-import React, { useEffect, useRef } from 'react';
+import React, { useEffect, useRef, memo, useMemo, useCallback } from 'react';
 import { useAppSelector } from '@/hooks/useAppSelector';
 import { useAppDispatch } from '@/hooks/useAppDispatch';
 import { initializeTheme } from './themeSlice';
@@ -9,12 +9,45 @@ type ChildrenProp = {
   children: React.ReactNode;
 };
 
-const ThemeWrapper = ({ children }: ChildrenProp) => {
+const ThemeWrapper = memo(({ children }: ChildrenProp) => {
   const dispatch = useAppDispatch();
   const themeMode = useAppSelector(state => state.themeReducer.mode);
   const isInitialized = useAppSelector(state => state.themeReducer.isInitialized);
   const configRef = useRef<HTMLDivElement>(null);
 
+  // Memoize theme configuration to prevent unnecessary re-renders
+  const themeConfig = useMemo(() => ({
+    algorithm: themeMode === 'dark' ? theme.darkAlgorithm : theme.defaultAlgorithm,
+    components: {
+      Layout: {
+        colorBgLayout: themeMode === 'dark' ? colors.darkGray : colors.white,
+        headerBg: themeMode === 'dark' ? colors.darkGray : colors.white,
+      },
+      Menu: {
+        colorBgContainer: colors.transparent,
+      },
+      Table: {
+        rowHoverBg: themeMode === 'dark' ? '#000' : '#edebf0',
+      },
+      Select: {
+        controlHeight: 32,
+      },
+    },
+    token: {
+      borderRadius: 4,
+    },
+  }), [themeMode]);
+
+  // Memoize the theme class name
+  const themeClassName = useMemo(() => `theme-${themeMode}`, [themeMode]);
+
+  // Memoize the media query change handler
+  const handleMediaQueryChange = useCallback((e: MediaQueryListEvent) => {
+    if (!localStorage.getItem('theme')) {
+      dispatch(initializeTheme());
+    }
+  }, [dispatch]);
+
   // Initialize theme after mount
   useEffect(() => {
     if (!isInitialized) {
@@ -26,15 +59,9 @@ const ThemeWrapper = ({ children }: ChildrenProp) => {
   useEffect(() => {
     const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
 
-    const handleChange = (e: MediaQueryListEvent) => {
-      if (!localStorage.getItem('theme')) {
-        dispatch(initializeTheme());
-      }
-    };
-
-    mediaQuery.addEventListener('change', handleChange);
-    return () => mediaQuery.removeEventListener('change', handleChange);
-  }, [dispatch]);
+    mediaQuery.addEventListener('change', handleMediaQueryChange);
+    return () => mediaQuery.removeEventListener('change', handleMediaQueryChange);
+  }, [handleMediaQueryChange]);
 
   // Add CSS transition classes to prevent flash
   useEffect(() => {
@@ -44,34 +71,14 @@ const ThemeWrapper = ({ children }: ChildrenProp) => {
   }, []);
 
   return (
-    <div ref={configRef} className={`theme-${themeMode}`}>
-      <ConfigProvider
-        theme={{
-          algorithm: themeMode === 'dark' ? theme.darkAlgorithm : theme.defaultAlgorithm,
-          components: {
-            Layout: {
-              colorBgLayout: themeMode === 'dark' ? colors.darkGray : colors.white,
-              headerBg: themeMode === 'dark' ? colors.darkGray : colors.white,
-            },
-            Menu: {
-              colorBgContainer: colors.transparent,
-            },
-            Table: {
-              rowHoverBg: themeMode === 'dark' ? '#000' : '#edebf0',
-            },
-            Select: {
-              controlHeight: 32,
-            },
-          },
-          token: {
-            borderRadius: 4,
-          },
-        }}
-      >
+    <div ref={configRef} className={themeClassName}>
+      <ConfigProvider theme={themeConfig}>
         {children}
       </ConfigProvider>
     </div>
   );
-};
+});
+
+ThemeWrapper.displayName = 'ThemeWrapper';
 
 export default ThemeWrapper;