melvinjjoseph/offlinePocket ? reverse-engineered prompt

Build me a Flutter app for Android called OfflinePocket that works like a private vault for credit cards and ID documents, but completely offline. I want users to be able to add cards and documents, scan them with the camera so the details auto fill, and then keep everything locked behind fingerprint or face unlock with device PIN as backup.

Please make it feel really security focused, with encrypted storage on the device, a screen lock so screenshots are blocked, and a backup and restore flow that exports a protected file users can save or share and later open to recover their data. It should also include an activity log that shows unlocks, failed unlocks, shares, exports, and purges, but never exposes the actual card values.

Use a clean modern UI with dark and light themes, a simple onboarding tour, search, and a settings area for things like auto lock and clipboard timeout. Keep it fully offline, no accounts, no cloud, no network calls. If you need current docs for any Flutter or Android security pieces, look them up online first.