🎨 Improve Dark Mode Theme Preview Structure

✅ Enhanced Dark Mode Preview:
- Restructured dark mode label to match light mode exactly
- Moved onClick handler to label level for better UX
- Removed nested div wrapper for cleaner structure
- Consistent theme-preview-card styling

🔧 Technical Improvements:
- Dark mode preview now has same structure as light mode
- Better click area coverage for theme selection
- Cleaner JSX hierarchy and organization
- Consistent preview card styling across themes

📋 Changes Made:
- src/InitialPage/themeSettings.jsx: Restructured dark mode preview
- Moved onClick={DarkThemes} to label element
- Removed unnecessary div wrapper
- Consistent indentation and structure

🎯 Benefits:
- Better visual consistency between light and dark previews
- Improved user interaction with larger click areas
- Cleaner code structure and organization
- Enhanced theme preview experience

🚀 Features:
- Both light and dark mode previews now have identical structure
- Consistent theme-preview-card styling
- Better responsive behavior
- Professional preview appearance

src/InitialPage/themeSettings.jsx

@@ -351,8 +351,11 @@ const ThemeSettings = () => {
                               defaultValue="dark_mode"
                               defaultChecked
                             />
-                            <label htmlFor="dark_mode" className="checktoggles theme-preview-card">
-                              <div onClick={DarkThemes}>
+                            <label
+                              htmlFor="dark_mode"
+                              className="checktoggles theme-preview-card"
+                              onClick={DarkThemes}
+                            >
                               {/* Custom Dark Mode Preview */}
                               <div className="theme-preview dark-preview">
                                 <div className="preview-header">
@@ -377,8 +380,6 @@ const ThemeSettings = () => {
                                   </div>
                                 </div>
                               </div>
-                              </div>
-
                               <span className="theme-name">
                                 <Moon size={14} style={{marginRight: '6px', verticalAlign: 'middle'}} />
                                 Dark Mode