LC mac 0f397859e6 feat(v1.3.0): add ephemeral session-key encryption for sensitive state ...

- Add src/lib/sessionCrypto.ts with AES-GCM-256 session keys
- Integrate into Backup flow: auto-clear plaintext mnemonic after QR gen
- Add Lock/Clear button to destroy key and clear all state
- Add cleanup on component unmount
- Fix unused imports and TypeScript strict mode errors

2026-01-29 23:35:08 +08:00

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