Add language and theme selection to the user settings menu

Integrates dropdown menus for theme (light/dark) and language selection into the header component, persisting choices in localStorage. Updates LoginModal title with SAPIENS logo.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 069d4324-6c40-4355-955e-c714a50de1ea
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/3df548ff-50ae-432f-9be4-25d34eccc983/069d4324-6c40-4355-955e-c714a50de1ea/9tQ591o

client/src/components/LoginModal.tsx

@@ -68,7 +68,14 @@ export default function LoginModal({ isOpen, onClose }: LoginModalProps) {
     <Dialog open={isOpen} onOpenChange={onClose}>
       <DialogContent className="sm:max-w-[425px]" data-testid="login-modal">
         <DialogHeader>
-          <DialogTitle>로그인</DialogTitle>
+          <DialogTitle className="flex items-center gap-2">
+            <span>Login to</span>
+            <img 
+              src="/attached_assets/logo_black_1759181850935.png" 
+              alt="SAPIENS" 
+              className="h-4 w-auto"
+            />
+          </DialogTitle>
         </DialogHeader>
         <form onSubmit={handleLogin} className="space-y-4">
           <div className="space-y-2">