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/__tests__/SignInScreen.test.tsx

@@ -1,7 +1,6 @@
 import React from 'react';
 import { render } from '@testing-library/react-native';
 import { AuthProvider } from '../../contexts/AuthContext';
-import { LanguageProvider } from '../../contexts/LanguageContext';
 import SignInScreen from '../SignInScreen';
 
 jest.mock('@react-navigation/native', () => ({
@@ -11,11 +10,9 @@ jest.mock('@react-navigation/native', () => ({
 
 // Wrapper with required providers
 const SignInScreenWrapper = () => (
-  <LanguageProvider>
-    <AuthProvider>
-      <SignInScreen />
-    </AuthProvider>
-  </LanguageProvider>
+  <AuthProvider>
+    <SignInScreen />
+  </AuthProvider>
 );
 
 describe('SignInScreen', () => {