Langage selection

[Qoder-Undefined]

Add language selection screen in Settings
🏠 BlockHaven-Labs / esustellar mobile | Priority: Low
📖 Context
Some users may want to use a language different from their device locale (e.g. a French speaker using an English phone). A language picker in Settings gives them that control.

🛠️ Tasks
Create mobile/app/settings/language.tsx
List available languages with their native name (e.g. 'English', 'Francais', 'Kiswahili')
Show a checkmark next to the currently selected language
On selection, update i18next.changeLanguage and persist the choice to AsyncStorage
Add 'Language' row to the Settings screen linking to this screen
✅ Acceptance Criteria
Language change takes effect immediately without app restart
Selected language persists across restarts
All available locales are listed with their native name
Settings row navigates to language screen
closes #292

Add PIN code setup and authentication screen

🏠 BlockHaven-Labs / esustellar mobile | Priority: High
📖 Context
A 6-digit PIN provides a fallback authentication method and an alternative for users without biometric hardware. This issue covers PIN setup and the PIN entry screen.

🛠️ Tasks
Create mobile/app/security/setup-pin.tsx with a 6-dot PIN entry pad
After entry, prompt for confirmation (enter PIN again)
Store a hashed PIN in SecureStore via expo-secure-store
Create mobile/app/security/enter-pin.tsx shown when biometric fails
Allow 3 failed attempts before locking the app for 30 seconds
Add 'Change PIN' option in Settings
✅ Acceptance Criteria
PIN is stored securely (not in plain text)
Confirmation step prevents typos
Failed attempts are counted and lockout works
'Change PIN' requires entering the current PIN first
closes #278

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