Adds ability to backup wallet seed phrase to Matrix SSSS: - WalletBackupService interface and implementation - New BACKUP_TO_MATRIX step in wallet setup flow - Recovery key input UI with FLAG_SECURE - Graceful handling of invalid keys and missing SSSS setup Users can now: 1. Write down seed phrase manually (existing) 2. Encrypt and store in Matrix account with recovery key The backup is encrypted with the same key used for cross-signing and message backup (SSSS). |
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