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__/WalletScreen.test.tsx

@@ -1,6 +1,5 @@
 import React from 'react';
 import { render } from '@testing-library/react-native';
-import { LanguageProvider } from '../../contexts/LanguageContext';
 import { PezkuwiProvider } from '../contexts/PezkuwiContext';
 import WalletScreen from '../WalletScreen';
 
@@ -10,11 +9,9 @@ jest.mock('@react-navigation/native', () => ({
 }));
 
 const WalletScreenWrapper = () => (
-  <LanguageProvider>
-    <PezkuwiProvider>
-      <WalletScreen />
-    </PezkuwiProvider>
-  </LanguageProvider>
+  <PezkuwiProvider>
+    <WalletScreen />
+  </PezkuwiProvider>
 );
 
 describe('WalletScreen', () => {