Refactor navigation and authentication flow, prevent mounting login page multiple times

- Improved protected route handling
- Enhanced direct login access detection
- Centralized navigation logic
- Optimized state reset process
- Fixed logout navigation behavior

lightrag_webui/src/components/AppSettings.tsx

@@ -32,7 +32,7 @@ export default function AppSettings({ className }: AppSettingsProps) {
   return (
     <Popover open={opened} onOpenChange={setOpened}>
       <PopoverTrigger asChild>
-        <Button variant="ghost" size="icon" className={cn("h-9 w-9", className)}>
+        <Button variant="ghost" size="icon" className={cn('h-9 w-9', className)}>
           <PaletteIcon className="h-5 w-5" />
         </Button>
       </PopoverTrigger>