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/__mocks__/contexts/AuthContext.tsx

@@ -22,7 +22,7 @@ const mockUser: User = {
   created_at: new Date().toISOString(),
 };
 
-const mockAuthContext: AuthContextType = {
+export const mockAuthContext: AuthContextType = {
   user: mockUser,
   session: null,
   loading: false,

mobile/src/__mocks__/contexts/BiometricAuthContext.tsx

@@ -7,20 +7,36 @@ interface BiometricAuthContextType {
   isBiometricAvailable: boolean;
   biometricType: 'fingerprint' | 'facial' | 'iris' | 'none';
   isBiometricEnabled: boolean;
+  isLocked: boolean;
+  autoLockTimer: number;
   authenticate: () => Promise<boolean>;
   enableBiometric: () => Promise<boolean>;
   disableBiometric: () => Promise<void>;
+  setPinCode: (pin: string) => Promise<void>;
+  verifyPinCode: (pin: string) => Promise<boolean>;
+  setAutoLockTimer: (minutes: number) => Promise<void>;
+  lock: () => void;
+  unlock: () => void;
+  checkAutoLock: () => Promise<void>;
 }
 
-const mockBiometricContext: BiometricAuthContextType = {
+export const mockBiometricContext: BiometricAuthContextType = {
   isBiometricSupported: true,
   isBiometricEnrolled: true,
   isBiometricAvailable: true,
   biometricType: 'fingerprint',
   isBiometricEnabled: false,
+  isLocked: false,
+  autoLockTimer: 5,
   authenticate: jest.fn().mockResolvedValue(true),
   enableBiometric: jest.fn().mockResolvedValue(true),
   disableBiometric: jest.fn().mockResolvedValue(undefined),
+  setPinCode: jest.fn().mockResolvedValue(undefined),
+  verifyPinCode: jest.fn().mockResolvedValue(true),
+  setAutoLockTimer: jest.fn().mockResolvedValue(undefined),
+  lock: jest.fn(),
+  unlock: jest.fn(),
+  checkAutoLock: jest.fn().mockResolvedValue(undefined),
 };
 
 const BiometricAuthContext = createContext<BiometricAuthContextType>(mockBiometricContext);

mobile/src/__mocks__/contexts/ThemeContext.tsx

@@ -19,7 +19,7 @@ interface ThemeContextType {
   fontScale: number;
 }
 
-const mockThemeContext: ThemeContextType = {
+export const mockThemeContext: ThemeContextType = {
   isDarkMode: false,
   toggleDarkMode: jest.fn().mockResolvedValue(undefined),
   colors: LightColors,