refactor: update Welcome and Onboarding components for improved structure and clarity

- Made the `isWeb` prop optional in the Welcome component for better flexibility.
- Simplified the Welcome page layout by consolidating the header into a single line.
- Removed unused Lottie animation references from the Onboarding component to streamline the code.

src/pages/Welcome.tsx

@@ -3,7 +3,7 @@ import { useNavigate } from 'react-router-dom';
 import RotatingTetrahedronCanvas from '../components/RotatingTetrahedronCanvas';
 
 interface WelcomeProps {
-  isWeb: boolean;
+  isWeb?: boolean;
 }
 
 const Welcome = ({ isWeb }: WelcomeProps) => {
@@ -16,9 +16,7 @@ const Welcome = ({ isWeb }: WelcomeProps) => {
           <RotatingTetrahedronCanvas />
         </div>
 
-        <h1 className="text-4xl font-semibold tracking-tight text-white md:text-6xl">
-          OpenHuman
-        </h1>
+        <h1 className="text-4xl font-semibold tracking-tight text-white md:text-6xl">OpenHuman</h1>
 
         <p className="max-w-xl text-sm opacity-70 md:text-base">
           Your AI superhuman for personal and business life.

src/pages/onboarding/Onboarding.tsx

@@ -1,7 +1,6 @@
 import { useState } from 'react';
 import { useNavigate } from 'react-router-dom';
 
-import LottieAnimation from '../../components/LottieAnimation';
 import ProgressIndicator from '../../components/ProgressIndicator';
 import { userApi } from '../../services/api/userApi';
 import { setOnboardedForUser } from '../../store/authSlice';
@@ -17,13 +16,6 @@ const Onboarding = () => {
   const [currentStep, setCurrentStep] = useState(0);
   const totalSteps = 3;
 
-  // Lottie animation files for each step
-  const stepAnimations = [
-    '/lottie/wave.json', // Step 1 - Features
-    '/lottie/safe3.json', // Step 2 - Privacy
-    '/lottie/trophy.json', // Step 3 - Get Started
-  ];
-
   const handleNext = () => {
     if (currentStep < totalSteps) {
       setCurrentStep(currentStep + 1);