refactor(mobile): Remove i18n, expand core screens, update plan

BREAKING: Removed multi-language support (i18n) - will be re-added later

Changes:
- Removed i18n system (6 language files, LanguageContext)
- Expanded WalletScreen, SettingsScreen, SwapScreen with more features
- Added KurdistanSun component, HEZ/PEZ token icons
- Added EditProfileScreen, WalletSetupScreen
- Added button e2e tests (Profile, Settings, Wallet)
- Updated plan: honest assessment - 42 nav buttons with mock data
- Fixed terminology: Polkadot→Pezkuwi, Substrate→Bizinikiwi

Reality check: UI complete with mock data, converting to production one-by-one

mobile/src/screens/WelcomeScreen.tsx

@@ -10,7 +10,6 @@ import {
   Image,
 } from 'react-native';
 import { LinearGradient } from 'expo-linear-gradient';
-import { useTranslation } from 'react-i18next';
 import AsyncStorage from '@react-native-async-storage/async-storage';
 import { KurdistanColors } from '../theme/colors';
 import PrivacyPolicyModal from '../components/PrivacyPolicyModal';
@@ -21,7 +20,6 @@ interface WelcomeScreenProps {
 }
 
 const WelcomeScreen: React.FC<WelcomeScreenProps> = ({ onContinue }) => {
-  const { t } = useTranslation();
   const [agreed, setAgreed] = useState(false);
   const [privacyModalVisible, setPrivacyModalVisible] = useState(false);
   const [termsModalVisible, setTermsModalVisible] = useState(false);