- Add Backup Import & Smart Merge wizard UI at /data-management with file preview, password unlock, and category harmonization

- Add Real-time Account Handover UI at /account-handover supporting QR scanning, clay-style PIN display, and mutual OTP confirmation

- Standardize layout container structure and safe-area margins across all 8 Admin Center pages and Integrations page

- Adjust header controls positioning (.finwise-header-controls) to maintain safe buffer from Zalo native capsule buttons

- Add complete bilingual i18n support (vi, en) and register protected routes in application layout