feat: add cloud and icon SVG assets; update app icon references in screens

src/screens/RegisterScreen.js

@@ -6,7 +6,6 @@ import {
 import { useTheme } from '../services/ThemeContext';
 import DatabaseService from '../services/DatabaseService';
 
-// App icon — same constant as LoginScreen
 const APP_ICON = require('../../assets/icon.png');
 
 const RegisterScreen = ({ navigation }) => {