[regeloapp-coder]

Summary

• Move authored books and drafts, creation, manuscript import, series management, export, statistics and deletion to the owner's Profile. Keep the Writing tab focused on writing goals and challenges.
• Encrypt the Room database with SQLCipher and wrap its random key with AES-GCM backed by Android Keystore.
• Convert existing plaintext SQLite data using a checkpointed temporary copy, validate it before atomic replacement, and fail without destructive fallback if the key or migration is unavailable.
• Update backup rules and release documentation; add plaintext SQLite-header detection tests.

Validation

• :app:testDebugUnitTest
• :app:assembleDebug
• :app:assembleRelease
• git diff --check

Limitations

The database conversion has not been exercised on a physical device or emulator in this environment; test the upgrade path with a backed-up test installation before rollout. Release assembly used no store keystore and is not a Play-signed bundle. The external account-deletion URL and Play Console disclosures remain owner-side release requirements.